Federal Agency Functional Activities

Total Page:16

File Type:pdf, Size:1020Kb

Federal Agency Functional Activities Appendix B – Federal Agency Functional Activities Bureau of Indian Affairs (BIA) Point of Contact: Wyeth (Chad) Wallace, (720) 407-0638 The mission of the Bureau of Indian Affairs (BIA) is to enhance the quality of life, to promote economic opportunity, and to carry out the responsibility to protect and improve the trust assets of American Indians, Indian tribes, and Alaska Natives. Divided into regions (see map), the BIA is responsible for the administration and management of 55 million surface acres and 57 million acres of subsurface minerals estates held in trust by the United States for approximately 1.9 million American Indians and Alaska Natives, and 565 federally recognized American Indian tribes. The primary public policy of the Federal government in regards to Native Americans is the return of trust lands management responsibilities to those most affected by decisions on how these American Indian Trust (AIT) lands are to be used and developed. Enhanced elevation data, orthoimagery, and GIS technology are needed to enable tribal organizations to wholly manage significant, profitable and sustainable enterprises as diverse as forestry, water resources, mining, oil and gas, transportation, tourism, agriculture and range land leasing and management, while preserving and protecting natural and cultural resources on AIT lands. Accurate and current elevation data are especially mission-critical for management of forest and water resources. It is the mission of BIA’s Irrigation, Power and Safety of Dams (IPSOD) program to promote self-determination, economic opportunities and public safety through the sound management of irrigation, dam and power facilities owned by the BIA. This program generates revenues for the irrigation and power projects of $80M to $90M annually. Additionally, water rights, mitigation, and all that goes along with water from forestry to fishing, are very important to Native Peoples, and any increase in knowledge of those water sources, watersheds and waterways is invaluable. Similarly, forest products on Native lands are harvested and sold through permits, and forest inventories are conducted to determine and record the volume and value of forest products harvested by ownership and to maintain records to document compliance. The wise stewardship of forests on AIT lands is critical because timber sales have exceeded $100M annually. LiDAR provides vital timber and biomass metrics plus slope data needed for Forest Management Plans and Fire Management Plans. Timber is real property; volumes and fair market values of the timber must be determined with a minimum sampling error of 15% as a part of Realty appraisal and to enhance sustainable forest product sales. BIA managers identified a single, all-inclusive Functional Activity with mission-critical requirements for enhanced elevation data: 101 • Protection and Enhancement of AIT Assets, under multiple Business Uses, but primarily Business Use #1, Natural Resources Conservation BIA managers provided the following assessments of elevation data requirements and benefits received from the enhanced elevation data Quality Level that they identified as mission-critical. Summarized details are provided in the following pages. 102 Protection and Enhancement of American Indian Trust (AIT) Assets Mission-Critical Requirements: QL3 LiDAR is required for management of forest and water resources on AIT lands and watersheds flowing into and out from AIT lands. Update Frequency: 6-10 years Business Use: Multiple Business Uses, but primarily Natural Resources Conservation, BU#1. Estimated program budgets supported by elevation data: Unknown Quantifiable Benefits of Enhanced Elevation Data: Unable to estimate cost savings from improved management of forest and water resources. Agency: BIA Functional Activity: Protection and Enhancement of American Indian Trust (AIT) Assets LiDAR is, by far, the best technology for detailed topographic mapping used for management of water and forest resources and for detecting subtle terrain features such as cultural resources important to Native Peoples. No other technology can accurately map the ground in dense forests while also mapping tree canopies, understory and biomass. Nationwide, foresters demand LiDAR for forest management to include science-based assessments of forest metrics and health. Furthermore, automated procedures for hydrologic and hydraulic (H&H) modeling are now performed, almost exclusively, with LiDAR data. Operational benefits (internal) for BIA of enhanced elevation data for this Functional Activity: Time/cost savings: Major Mission Compliance: Major $ Benefits: Unable to estimate • Improved safety and efficiency in management of irrigation, dam, and power facilities owned by BIA through accurate hydrologic modeling and dam breach modeling and assessments. The BIA monitors more than 430 dams in its IPSOD program with potentially major savings from LiDAR for dam safety assessments alone, but cost savings cannot be estimated. • BIA will not be replacing its continuous forest inventories (CFIs) and will continue to use existing programs and equations. However, LiDAR would supplement those efforts by assisting in computing forest metrics and biomass for estimation of timber volumes available for harvesting and sale. Furthermore BIA could inventory reservations that either have limited resources or are remote or are not actively managing their resources. Cost savings cannot be estimated. • Accurate topographic mapping for other assessments (e.g., wildlife habitat, environmental, agricultural, transportation, mining, and oil and gas development) on AIT lands. 103 • Accurate and consistent elevation data across jurisdictional boundaries enables BIA to perform its mission to protect and enhance AIT assets by efficient management of natural and cultural resources. • Technology and data that enable BIA to do more with limited staff and budget. Customer service benefits (external) to the public from improved BIA products/services: Performance: Major Timeliness: Major Experience: Major $ Benefits: Unknown • Important decisions can be made more quickly when accurate data are available for analysis. • Fire modeling across jurisdictional boundaries is effective and efficient with LiDAR. • Tribes and tribal organizations can wholly manage significant, profitable and sustainable enterprises when accurate and current topographic data are available, and when they learn how to use such data with GIS tools for effective and efficient management of natural and cultural resources. • Watershed mitigation on a large scale – yarder ground (generally more than 35% slope), cat ground (up to 35% slope), and helicopter ground (generally steep ground but usually inaccessible by other logging methods) can be determined, from which timber values are determined and harvest boundaries set; Tribes and tribal organizations can use LiDAR to plan for the future management of their forests. • Irrigation and power projects would be more efficient when using enhanced elevation data for H&H modeling and assessments, but annual dollar benefits cannot be estimated. • For homesite lease preparation, LiDAR would better serve the tribes for right-of-way and leasing benefits. • By embracing 21st century technology, including LiDAR and GIS, Tribes and tribal organizations will be better able to preserve and protect natural and cultural resources for future generations. Other Benefits from BIA’s use of enhanced elevation data for this Functional Activity: Public/Social: Major Environmental: Major Strategic/Political: Major • LiDAR is mission-critical for executing AIT Trust responsibilities to be wise stewards of AIT lands. • Better protection of the natural environment and cultural resources on AIT lands. • Technology transfer that enables tribal programs to stand-up applications of geospatial technology and by extending the reach of these applications by providing rich sources of elevation data from which informed decision making can be enabled. • Improved public interest and better public understanding of environmental issues confronting AIT assets. Better data improves BIA’s ability to relay information on management activity to the public so they can see what is being done instead of being told what is being done. 104 Bureau of Land Management (BLM) Point of Contact: Don Buhler, (202) 912-7353 The BLM’s stated mission is to sustain the health, diversity and productivity of the public lands for the use and enjoyment of present and future generations. The Bureau of Land Management (BLM) is responsible for stewardship of public lands of approximately 253 million surface acres, about one- eighth of the land area of the United States, as well as approximately 700 million acres of subsurface mineral estate underlying both Federal surface ownerships and privately owned lands. These public lands surface acres are primarily in 12 western states, including Alaska. The BLM is committed to managing, protecting, and improving these lands in a manner to serve the needs of the American people. Management is passed upon the principles of multiple use and sustained yield of our Nation’s resources within a framework of environmental responsibility and scientific technology. Following is a list of some of the natural resource programs and projects currently managed by the BLM that are engaged in using or managing elevation data within the Bureau: Abandoned Mine Lands Forests and Woodlands Asset Management Hazardous Materials Management BLM Enterprise Architecture Information
Recommended publications
  • PRELUDE to SEVEN SLOTS: FILLING and SUBSEQUENT MODIFICATION of SEVEN BROAD CANYONS in the NAVAJO SANDSTONE, SOUTH-CENTRAL UTAH by David B
    PRELUDE TO SEVEN SLOTS: FILLING AND SUBSEQUENT MODIFICATION OF SEVEN BROAD CANYONS IN THE NAVAJO SANDSTONE, SOUTH-CENTRAL UTAH by David B. Loope1, Ronald J. Goble1, and Joel P. L. Johnson2 ABSTRACT Within a four square kilometer portion of Grand Staircase-Escalante National Monument, seven distinct slot canyons cut the Jurassic Navajo Sandstone. Four of the slots developed along separate reaches of a trunk stream (Dry Fork of Coyote Gulch), and three (including canyons locally known as “Peekaboo” and “Spooky”) are at the distal ends of south-flowing tributary drainages. All these slot canyons are examples of epigenetic gorges—bedrock channel reaches shifted laterally from previous reach locations. The previous channels became filled with alluvium, allowing active channels to shift laterally in places and to subsequently re-incise through bedrock elsewhere. New evidence, based on optically stimulated luminescence (OSL) ages, indicates that this thick alluvium started to fill broad, pre-existing, bedrock canyons before 55,000 years ago, and that filling continued until at least 48,000 years ago. Streams start to fill their channels when sediment supply increases relative to stream power. The following conditions favored alluviation in the study area: (1) a cooler, wetter climate increased the rate of mass wasting along the Straight Cliffs (the headwaters of Dry Fork) and the rate of weathering of the broad outcrops of Navajo and Entrada Sandstone; (2) windier conditions increased the amount of eolian sand transport, perhaps destabilizing dunes and moving their stored sediment into stream channels; and (3) southward migration of the jet stream dimin- ished the frequency and severity of convective storms.
    [Show full text]
  • Geomorphic Classification of Rivers
    9.36 Geomorphic Classification of Rivers JM Buffington, U.S. Forest Service, Boise, ID, USA DR Montgomery, University of Washington, Seattle, WA, USA Published by Elsevier Inc. 9.36.1 Introduction 730 9.36.2 Purpose of Classification 730 9.36.3 Types of Channel Classification 731 9.36.3.1 Stream Order 731 9.36.3.2 Process Domains 732 9.36.3.3 Channel Pattern 732 9.36.3.4 Channel–Floodplain Interactions 735 9.36.3.5 Bed Material and Mobility 737 9.36.3.6 Channel Units 739 9.36.3.7 Hierarchical Classifications 739 9.36.3.8 Statistical Classifications 745 9.36.4 Use and Compatibility of Channel Classifications 745 9.36.5 The Rise and Fall of Classifications: Why Are Some Channel Classifications More Used Than Others? 747 9.36.6 Future Needs and Directions 753 9.36.6.1 Standardization and Sample Size 753 9.36.6.2 Remote Sensing 754 9.36.7 Conclusion 755 Acknowledgements 756 References 756 Appendix 762 9.36.1 Introduction 9.36.2 Purpose of Classification Over the last several decades, environmental legislation and a A basic tenet in geomorphology is that ‘form implies process.’As growing awareness of historical human disturbance to rivers such, numerous geomorphic classifications have been de- worldwide (Schumm, 1977; Collins et al., 2003; Surian and veloped for landscapes (Davis, 1899), hillslopes (Varnes, 1958), Rinaldi, 2003; Nilsson et al., 2005; Chin, 2006; Walter and and rivers (Section 9.36.3). The form–process paradigm is a Merritts, 2008) have fostered unprecedented collaboration potentially powerful tool for conducting quantitative geo- among scientists, land managers, and stakeholders to better morphic investigations.
    [Show full text]
  • River Dynamics 101 - Fact Sheet River Management Program Vermont Agency of Natural Resources
    River Dynamics 101 - Fact Sheet River Management Program Vermont Agency of Natural Resources Overview In the discussion of river, or fluvial systems, and the strategies that may be used in the management of fluvial systems, it is important to have a basic understanding of the fundamental principals of how river systems work. This fact sheet will illustrate how sediment moves in the river, and the general response of the fluvial system when changes are imposed on or occur in the watershed, river channel, and the sediment supply. The Working River The complex river network that is an integral component of Vermont’s landscape is created as water flows from higher to lower elevations. There is an inherent supply of potential energy in the river systems created by the change in elevation between the beginning and ending points of the river or within any discrete stream reach. This potential energy is expressed in a variety of ways as the river moves through and shapes the landscape, developing a complex fluvial network, with a variety of channel and valley forms and associated aquatic and riparian habitats. Excess energy is dissipated in many ways: contact with vegetation along the banks, in turbulence at steps and riffles in the river profiles, in erosion at meander bends, in irregularities, or roughness of the channel bed and banks, and in sediment, ice and debris transport (Kondolf, 2002). Sediment Production, Transport, and Storage in the Working River Sediment production is influenced by many factors, including soil type, vegetation type and coverage, land use, climate, and weathering/erosion rates.
    [Show full text]
  • Channel Aggradation by Beaver Dams on a Small Agricultural Stream in Eastern Nebraska
    University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln U.S. Department of Agriculture: Agricultural Publications from USDA-ARS / UNL Faculty Research Service, Lincoln, Nebraska 9-12-2004 Channel Aggradation by Beaver Dams on a Small Agricultural Stream in Eastern Nebraska M. C. McCullough University of Nebraska-Lincoln J. L. Harper University of Nebraska-Lincoln D. E. Eisenhauer University of Nebraska-Lincoln, [email protected] M. G. Dosskey USDA National Agroforestry Center, Lincoln, Nebraska, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/usdaarsfacpub Part of the Agricultural Science Commons McCullough, M. C.; Harper, J. L.; Eisenhauer, D. E.; and Dosskey, M. G., "Channel Aggradation by Beaver Dams on a Small Agricultural Stream in Eastern Nebraska" (2004). Publications from USDA-ARS / UNL Faculty. 147. https://digitalcommons.unl.edu/usdaarsfacpub/147 This Article is brought to you for free and open access by the U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Publications from USDA-ARS / UNL Faculty by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. This is not a peer-reviewed article. Self-Sustaining Solutions for Streams, Wetlands, and Watersheds, Proceedings of the 12-15 September 2004 Conference (St. Paul, Minnesota USA) Publication Date 12 September 2004 ASAE Publication Number 701P0904. Ed. J. L. D'Ambrosio Channel Aggradation by Beaver Dams on a Small Agricultural Stream in Eastern Nebraska M. C. McCullough1, J. L. Harper2, D.E. Eisenhauer3, M. G. Dosskey4 ABSTRACT We assessed the effect of beaver dams on channel gradation of an incised stream in an agricultural area of eastern Nebraska.
    [Show full text]
  • How to Make a Meandering River
    COMMENTARY How to make a meandering river Alan D. Howard1 Department of Environmental Sciences, P.O. Box 400123, University of Virginia, Charlottesville, VA 22904-4123 espite the ubiquity of mean- dering rivers in nature, only recently have appropriate ex- perimental conditions been Dproduced to replicate a stably meander- ing stream in the laboratory, as de- scribed in a recent issue of PNAS (1). Meandering channels occur in a wide variety of sedimentary environments, including on deep sea fans formed by turbidity currents (2), as relict meanders on Mars (3) (Fig. 1), and as channels formed by flowing alkenes on Titan. The mechanics of formation of mean- ders is reasonably well understood (4). When flow enters a channel bed, a heli- cal secondary current is set up that in- creases flow velocity and channel depth along the outer bank in proportion to bed curvature, which encourages bank erosion. The secondary current has an intrinsic downstream scale related to flow velocity and depth; this results in gradual increase in bend amplitude and propagation of the meandering pattern upstream and downstream. Linear the- ory of flow in bends (5) has permitted construction of simulation models that replicate many aspects of meandering Fig. 1. Fossil highly sinuous meandering channel and floodplain on Mars. Red arrows point to repre- behavior, including meander cutoffs, sentative locations along channel. The channel bed is now a ridge (in inverted relief) because wind erosion creation of oxbow lakes, and patterns of has removed finer sediment from the floodplain and surrounding terrain. The low curvilinear ridges floodplain sedimentation (6, 7).
    [Show full text]
  • Re-Creating Meander Geometry Photo(S)
    Practice Title Re-creating meander geometry Photo(s) Greene County streams after their meander geometry was restored to the extent necessary to move sediment and flow without excess erosion or deposition (bottom photos). The proper meander geometry is determined through detailed stream assessment. Also, a diagram showing the typical position of pools and riffles within a meandering stream, and a few other stream meander geometry patterns (top). Summary of Practice The winding pattern of a river or stream is called its meander pattern. These meanders result in a longer channel with a lower slope. These curves slow down the water and absorb energy, which helps to reduce the potential for erosion. The velocity of a stream is typically greatest on the outside of a meander bend. The increased force of this water often results in erosion along this bank, extending a short distance downstream. On the inside of the bend, the stream velocity typically decreases, which often results in the deposition of sediment, usually sand and gravel. If you could look at the long-term history of a valley over hundreds or thousands of years, you would see that the stream has moved back and forth across the valley bottom. In fact, this lateral migration of the channel, accompanied by down cutting, is what has formed the valley. Success in stream management is based on working with the stream, not against it. If a reach of channel is suffering unusual bank erosion, down cutting of the bed, aggradation, change of channel pattern, or other evidence of instability, a realistic approach to addressing these problems should be based on restoring the system’s equilibrium.
    [Show full text]
  • Channel Aggradation by Beaver Darns on a Small Agricultural Stream In
    /'/ ,L. 8'-- Channel Aggradation by Beaver Darns on a Small Agricultural Stream in. Eastern Nebraska 41. C. ~e~ullou~h',J. L. 33arperz,D.E. ~isenbauer',41. G.~osske~' MSTUCT We assessed the effect of beaver dams on channel gadation of an incised stream in an agricultural area of eastern Nebraska. A topogaphic survey was conducted of a reach of Little hluddy Creek where beaver are known to have been building dams for twelve years. Results indicate that over this time period the thalweg elevation has aggraded an average of 0.65 m by trapping 1730 t of sediment in the pools behd dams. Beaver may provide a feasible solution to channel depradation problems in this region. =WORDS. Beaver dams, channel aggradation, sediment, agricultural watershed. In eastern Nebraska, most land, which at one time was tallgrass prairie, has been converted to agricultural land use. This conversion has impacted stream channels both directly and indirectly. One major impact of row-crop agriculture is the increase in overland runoff and peak flows in channels. Between 1904 and 19 15 many stream channels in southeastern Hebraska were dredged and straightened (Wahl and Weiss 19881, resulting in shorter and steeper channels. These changes have resulted in severe channel incision and stream bank instability in eastern Nebraska and throughout the deep loess regions of the central Tjniied States (Lohnes 1997). This trend towards continued channel degradation continues to this day (Zellars and Hotc~ss1997), creating environmental and economic concerns. Beaver aEect geomorphology of streams in ways that may counteract channel degrading processes. Beaver dams reduce stream velocities, causing the rate of sediment deposition to increase behind the dam (Naiman et al.
    [Show full text]
  • Channel Morphology of the Shag River, North Otago 2
    Channel morphology of the Shag River, North Otago Channel Morphology of the Shag River, North Otago 2 Otago Regional Council Private Bag 1954, Dunedin 9054 70 Stafford Street, Dunedin 9016 Phone 03 474 0827 Fax 03 479 0015 Freephone 0800 474 082 www.orc.govt.nz © Copyright for this publication is held by the Otago Regional Council. This publication may be reproduced in whole or in part provided the source is fully and clearly acknowledged. ISBN: 978-0-478-37692-0 Report writer: Jacob Williams, Natural Hazards Analyst Reviewed by: Michael Goldsmith, Manager Natural Hazards Published September 2014 3 Channel Morphology of the Shag River, North Otago Technical summary Changes in the channel morphology of the Shag River/Waihemo have been assessed using visual inspections, aerial and ground photography, and cross-section data collected in April 2009 and October 2013. This assessment provides an update on changes in channel morphology that have occurred since the last catchment-wide analysis of long term trends in 2009. This report describes the nature of those changes where they have been significant and is intended to inform decisions relating to the management of the Shag River/Waihemo, including gravel extraction, floodwater conveyance, and asset management. Cross-section analysis of the Shag River/Waihemo indicates that between April 2009 and October 2013 there was an overall increase in mean bed level (MBL) at 16 of the 22 surveyed cross-sections (as shown on Figure 5), and a decrease in MBL at 6 cross-sections. This indicates that (in the short term) the Shag River/Waihemo is showing signs of changing from a state of overall degradation (as described in the previous analysis of channel morphology in 2009) to one of aggradation/stability.
    [Show full text]
  • Advanced Numerical Modeling of Sediment Transport in Gravel-Bed Rivers
    water Article Advanced Numerical Modeling of Sediment Transport in Gravel-Bed Rivers Van Hieu Bui 1,2,* , Minh Duc Bui 1 and Peter Rutschmann 1 1 Institute of Hydraulic and Water Resources Engineering, Technische Universität München, Arcisstrasse 21, D-80333 München, Germany; [email protected] (M.D.B.); [email protected] (P.R.) 2 Faculty of Mechanical Engineering, Thuyloi University, 175 Tay Son, Dong Da, Hanoi 100000, Vietnam * Correspondence: [email protected]; Tel.: +49-152-134-15987 Received: 15 February 2019; Accepted: 13 March 2019; Published: 17 March 2019 Abstract: Understanding the alterations of gravel bed structures, sediment transport, and the effects on aquatic habitat play an essential role in eco-hydraulic and sediment transport management. In recent years, the evaluation of changes of void in bed materials has attracted more concern. However, analyzing the morphological changes and grain size distribution that are associated with the porosity variations in gravel-bed rivers are still challenging. This study develops a new model using a multi-layer’s concept to simulate morphological changes and grain size distribution, taking into account the porosity variabilities in a gravel-bed river based on the mass conservation for each size fraction and the exchange of fine sediments between the surface and subsurface layers. The Discrete Element Method (DEM) is applied to model infiltration processes and to confirm the effects of the relative size of fine sediment to gravel on the infiltration depth. Further, the exchange rate and the bed porosity are estimated while using empirical formulae. The new model was tested on three straight channels.
    [Show full text]
  • Hydrology Is Generally Defined As a Science Dealing with the Interrelation- 7.2.2 Ship Between Water on and Under the Earth and in the Atmosphere
    C H A P T E R 7 H Y D R O L O G Y Chapter Table of Contents October 2, 1995 7.1 -- Hydrologic Design Policies - 7.1.1 Introduction 7-4 - 7.1.2 Surveys 7-4 - 7.1.3 Flood Hazards 7-4 - 7.1.4 Coordination 7-4 - 7.1.5 Documentation 7-4 - 7.1.6 Factors Affecting Flood Runoff 7-4 - 7.1.7 Flood History 7-5 - 7.1.8 Hydrologic Method 7-5 - 7.1.9 Approved Methods 7-5 - 7.1.10 Design Frequency 7-6 - 7.1.11 Risk Assessment 7-7 - 7.1.12 Review Frequency 7-7 7.2 -- Overview - 7.2.1 Introduction 7-8 - 7.2.2 Definition 7-8 - 7.2.3 Factors Affecting Floods 7-8 - 7.2.4 Sources of Information 7-8 7.3 -- Symbols And Definitions 7-9 7.4 -- Hydrologic Analysis Procedure Flowchart 7-11 7.5 -- Concept Definitions 7-12 7.6 -- Design Frequency - 7.6.1 Overview 7-14 - 7.6.2 Design Frequency 7-14 - 7.6.3 Review Frequency 7-15 - 7.6.4 Frequency Table 7-15 - 7.6.5 Rainfall vs. Flood Frequency 7-15 - 7.6.6 Rainfall Curves 7-15 - 7.6.7 Discharge Determination 7-15 7.7 -- Hydrologic Procedure Selection - 7.7.1 Overview 7-16 - 7.7.2 Peak Flow Rates or Hydrographs 7-16 - 7.7.3 Hydrologic Procedures 7-16 7.8 -- Calibration - 7.8.1 Definition 7-18 - 7.8.2 Hydrologic Accuracy 7-18 - 7.8.3 Calibration Process 7-18 7–1 Chapter Table of Contents (continued) 7.9 -- Rational Method - 7.9.1 Introduction 7-20 - 7.9.2 Application 7-20 - 7.9.3 Characteristics 7-20 - 7.9.4 Equation 7-21 - 7.9.5 Infrequent Storm 7-22 - 7.9.6 Procedures 7-22 7.10 -- Example Problem - Rational Formula 7-33 7.11 -- USGS Rural Regression Equations - 7.11.1 Introduction 7-36 - 7.11.2 MDT Application 7-36
    [Show full text]
  • Modeling Coastal River, Wetland, and Shoreline Dynamics
    From the River to the Sea: Modeling Coastal River, Wetland, and Shoreline Dynamics by Katherine Murray Ratliff Earth & Ocean Sciences Duke University Date: Approved: A. Brad Murray, Supervisor Marco Marani Peter Haff James Heffernan Dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Earth & Ocean Sciences in the Graduate School of Duke University 2017 Abstract From the River to the Sea: Modeling Coastal River, Wetland, and Shoreline Dynamics by Katherine Murray Ratliff Earth & Ocean Sciences Duke University Date: Approved: A. Brad Murray, Supervisor Marco Marani Peter Haff James Heffernan An abstract of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Earth & Ocean Sciences in the Graduate School of Duke University 2017 Copyright c 2017 by Katherine Murray Ratliff All rights reserved except the rights granted by the Creative Commons Attribution-Noncommercial Licence Abstract Complex feedbacks dominate landscape dynamics over large spatial scales (10s { 100s km) and over the long-term (10s { 100s yrs). These interactions and feedbacks are particularly strong at land-water boundaries, such as coastlines, marshes, and rivers. Water, although necessary for life and agriculture, threatens humans and infrastructure during natural disasters (e.g., floods, hurricanes) and through sea-level rise. The goal of this dissertation is to better understand landscape morphodynamics in these settings, and in some cases, to investigate how humans have influenced these landscapes (e.g., through climate or land-use change). In this work, I use innovative numerical models to study the larger-scale emergent interactions and most critical variables of these systems, allowing me to clarify the most important feedbacks and explore large space and time scales.
    [Show full text]
  • Chapter 4. Sediment Transport and Deposition
    CHAPTER 4. SEDIMENT TRANSPORT AND DEPOSITION INTRODUCTION Purpose An analysis was performed to characterize sediment conditions of the Lower Puyallup River, quantify sediment inflow to the study reach, assess recent changes in the river cross section due to sediment deposition and aggradation, and develop a numerical sedimentation model for forecasting future deposition along the Lower Puyallup. A HEC-RAS sediment transport model (Hydrologic Engineering Center, Version 4.0, 2006) was developed to predict the location, volume and depth of sediment deposition or erosion through the study reach. The primary objective of the sediment investigation was to provide a 50-year forecast of bed adjustments related to sediment deposits that may affect the river channel’s flood carrying capacity. The sediment model was developed and calibrated using information from surveyed channel cross sections, site specific measurements of sediment transport rates, measurements of existing bed material characteristics, and analysis of hydrologic conditions. It was then used to estimate future channel aggradation in the study area. The results provide estimates of future channel geometry, which when input into the HEC-RAS hydraulic model reveal how flood profiles are likely to be affected by sediment deposition 50 years in the future. The analysis assumes that no significant sediment maintenance activity (i.e. channel dredging) occurs during the 50-year forecast period. Prior Studies Previous sediment and hydraulic studies of the Puyallup River include the following: • Flood-Carrying Capacities and Changes in Channels of the Lower Puyallup, White, and Carbon Rivers in Western Washington (USGS, 1988) • Sediment Transport in the Lower Puyallup, White and Carbon Rivers of Western Washington (USGS, 1989) • Flood Insurance Mapping Study for Puyallup River (FEMA, 2007).
    [Show full text]