On the Formation of Fluvial Islands
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Transitions for the Delta Economy
Transitions for the Delta Economy January 2012 Josué Medellín-Azuara, Ellen Hanak, Richard Howitt, and Jay Lund with research support from Molly Ferrell, Katherine Kramer, Michelle Lent, Davin Reed, and Elizabeth Stryjewski Supported with funding from the Watershed Sciences Center, University of California, Davis Summary The Sacramento-San Joaquin Delta consists of some 737,000 acres of low-lying lands and channels at the confluence of the Sacramento and San Joaquin Rivers (Figure S1). This region lies at the very heart of California’s water policy debates, transporting vast flows of water from northern and eastern California to farming and population centers in the western and southern parts of the state. This critical water supply system is threatened by the likelihood that a large earthquake or other natural disaster could inflict catastrophic damage on its fragile levees, sending salt water toward the pumps at its southern edge. In another area of concern, water exports are currently under restriction while regulators and the courts seek to improve conditions for imperiled native fish. Leading policy proposals to address these issues include improvements in land and water management to benefit native species, and the development of a “dual conveyance” system for water exports, in which a new seismically resistant canal or tunnel would convey a portion of water supplies under or around the Delta instead of through the Delta’s channels. This focus on the Delta has caused considerable concern within the Delta itself, where residents and local governments have worried that changes in water supply and environmental management could harm the region’s economy and residents. -
SPACE RESEARCH in POLAND Report to COMMITTEE
SPACE RESEARCH IN POLAND Report to COMMITTEE ON SPACE RESEARCH (COSPAR) 2020 Space Research Centre Polish Academy of Sciences and The Committee on Space and Satellite Research PAS Report to COMMITTEE ON SPACE RESEARCH (COSPAR) ISBN 978-83-89439-04-8 First edition © Copyright by Space Research Centre Polish Academy of Sciences and The Committee on Space and Satellite Research PAS Warsaw, 2020 Editor: Iwona Stanisławska, Aneta Popowska Report to COSPAR 2020 1 SATELLITE GEODESY Space Research in Poland 3 1. SATELLITE GEODESY Compiled by Mariusz Figurski, Grzegorz Nykiel, Paweł Wielgosz, and Anna Krypiak-Gregorczyk Introduction This part of the Polish National Report concerns research on Satellite Geodesy performed in Poland from 2018 to 2020. The activity of the Polish institutions in the field of satellite geodesy and navigation are focused on the several main fields: • global and regional GPS and SLR measurements in the frame of International GNSS Service (IGS), International Laser Ranging Service (ILRS), International Earth Rotation and Reference Systems Service (IERS), European Reference Frame Permanent Network (EPN), • Polish geodetic permanent network – ASG-EUPOS, • modeling of ionosphere and troposphere, • practical utilization of satellite methods in local geodetic applications, • geodynamic study, • metrological control of Global Navigation Satellite System (GNSS) equipment, • use of gravimetric satellite missions, • application of GNSS in overland, maritime and air navigation, • multi-GNSS application in geodetic studies. Report -
Mawrth Vallis, Mars: a Fascinating Place for Future in Situ Exploration
Mawrth Vallis, Mars: a fascinating place for future in situ exploration François Poulet1, Christoph Gross2, Briony Horgan3, Damien Loizeau1, Janice L. Bishop4, John Carter1, Csilla Orgel2 1Institut d’Astrophysique Spatiale, CNRS/Université Paris-Sud, 91405 Orsay Cedex, France 2Institute of Geological Sciences, Planetary Sciences and Remote Sensing Group, Freie Universität Berlin, Germany 3Purdue University, West Lafayette, USA. 4SETI Institute/NASA-ARC, Mountain View, CA, USA Corresponding author: François Poulet, IAS, Bâtiment 121, CNRS/Université Paris-Sud, 91405 Orsay Cedex, France; email: [email protected] Running title: Mawrth: a fascinating place for exploration 1 Abstract After the successful landing of the Mars Science Laboratory rover, both NASA and ESA initiated a selection process for potential landing sites for the Mars2020 and ExoMars missions, respectively. Two ellipses located in the Mawrth Vallis region were proposed and evaluated during a series of meetings (3 for Mars2020 mission and 5 for ExoMars). We describe here the regional context of the two proposed ellipses as well as the framework of the objectives of these two missions. Key science targets of the ellipses and their astrobiological interests are reported. This work confirms the proposed ellipses contain multiple past Martian wet environments of subaerial, subsurface and/or subaqueous character, in which to probe the past climate of Mars, build a broad picture of possible past habitable environments, evaluate their exobiological potentials and search for biosignatures in well-preserved rocks. A mission scenario covering several key investigations during the nominal mission of each rover is also presented, as well as descriptions of how the site fulfills the science requirements and expectations of in situ martian exploration. -
Preprint 06-041
SME Annual Meeting Mar. 27-Mar.29, 2006, St. Louis, MO Preprint 06-041 A MEANDER CUTOFF INTO A GRAVEL EXTRACTION POND, CLACKAMAS RIVER, OREGON P. J. Wampler, Grand Valley State Univ., Allendale, MI E. F. Schnitzer, Dept. of Geology and Mineral Industries, Albany, OR D. Cramer, Portland General Electric, Estacada, OR C. Lidstone, Lidstone and Assoc(s)., Fort Collins, CO Abstract Introduction The River Island mining site is located at approximately river mile The River Island site provides a unique opportunity to examine (RM) 15 on the Clackamas River, a large gravel-bed river in northwest the physical changes to a river channel resulting from avulsion into a Oregon. During major flooding in February 1996, rapid channel gravel extraction pond. Data from before and after the meander cutoff change occurred. The natural process of meander cutoff, slowed for allow evaluation of changes to river geometry, sediment transport, several years by dike construction, was accelerated by erosion into temperature, habitat, and channel form. gravel extraction ponds on the inside of a meander bend during the An avulsion is defined as a lateral migration or cutoff of a river. It flood. involves the diversion of water from the primary channel into a new In a matter of hours, the river cut off a meander and began flowing channel that is either created during the event or reoccupied. through a series of gravel pits located on the inside of the meander Avulsions may be rapid or take many years to complete (Slingerland bend. The cutoff resulted in a reduction in reach length of and Smith, 2004). -
Three-Decadal Dynamics of Mid-Channel Bars in Downstream Of
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2019-69 Manuscript under review for journal Hydrol. Earth Syst. Sci. Discussion started: 14 March 2019 c Author(s) 2019. CC BY 4.0 License. Three-decadal dynamics of mid-channel bars in downstream of the Three Gorges Dam, China Zhaofei Wen1,2, Hong Yang3,4, Changhong Ding5, Ce Zhang6, Guofan Shao2, Jilong Chen1, Mingquan Lv1, Shengjun Wu1, Zhenfeng Shao7 5 1Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China 2Department of Forestry and Natural Resources, Purdue University, West Lafayette, 47906, USA 3State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Beijing East Road 73, Nanjing, 210008, China 10 4epartment of Geography and Environmental Science, University of Reading, Whiteknights, Reading RG6 6AB, UK 5Aviation University Air Force, Changchun, 130022, China 6Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK 7State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, 430079, China 15 Correspondence to: Zhaofei Wen ([email protected]) Abstract. The downstream of the world’s largest Three Gorges Dam (TGD) along Yangtze River (1560 km) hosts numerous mid-channel bars (MCBs). The morphodynamics of these MCBs are crucial to the river’s hydrological processing, local ecological functioning and socioeconomic development. However, a systematic understanding of such dynamics and their 20 linkages to the TGD across the entire downstream reach remain largely unknown. Using Landsat archive images and a thematic extracting scheme, the work presents comprehensive monitoring of MCB dynamics in terms of number, area, and shape, in the downstream of the TGD during 1985–2018. -
March 21–25, 2016
FORTY-SEVENTH LUNAR AND PLANETARY SCIENCE CONFERENCE PROGRAM OF TECHNICAL SESSIONS MARCH 21–25, 2016 The Woodlands Waterway Marriott Hotel and Convention Center The Woodlands, Texas INSTITUTIONAL SUPPORT Universities Space Research Association Lunar and Planetary Institute National Aeronautics and Space Administration CONFERENCE CO-CHAIRS Stephen Mackwell, Lunar and Planetary Institute Eileen Stansbery, NASA Johnson Space Center PROGRAM COMMITTEE CHAIRS David Draper, NASA Johnson Space Center Walter Kiefer, Lunar and Planetary Institute PROGRAM COMMITTEE P. Doug Archer, NASA Johnson Space Center Nicolas LeCorvec, Lunar and Planetary Institute Katherine Bermingham, University of Maryland Yo Matsubara, Smithsonian Institute Janice Bishop, SETI and NASA Ames Research Center Francis McCubbin, NASA Johnson Space Center Jeremy Boyce, University of California, Los Angeles Andrew Needham, Carnegie Institution of Washington Lisa Danielson, NASA Johnson Space Center Lan-Anh Nguyen, NASA Johnson Space Center Deepak Dhingra, University of Idaho Paul Niles, NASA Johnson Space Center Stephen Elardo, Carnegie Institution of Washington Dorothy Oehler, NASA Johnson Space Center Marc Fries, NASA Johnson Space Center D. Alex Patthoff, Jet Propulsion Laboratory Cyrena Goodrich, Lunar and Planetary Institute Elizabeth Rampe, Aerodyne Industries, Jacobs JETS at John Gruener, NASA Johnson Space Center NASA Johnson Space Center Justin Hagerty, U.S. Geological Survey Carol Raymond, Jet Propulsion Laboratory Lindsay Hays, Jet Propulsion Laboratory Paul Schenk, -
RD799 Five Year Plan
Reclamation District 799 Five Year Capital Improvement Plan May 2012 Prepared by 2365 Iron Point Road, Suite 300 Folsom, CA 95630 This page intentionally left blank. RD 799 Five Year Plan Contents 1.0 Executive Summary .............................................................................................................. 1 2.0 Brief History of Hotchkiss Tract .......................................................................................... 3 2.1 Location .............................................................................................................................................. 3 2.2 Geomorphic Evolution ........................................................................................................................ 4 2.3 Historical Flood Events ....................................................................................................................... 6 2.3.1 Existing level of protection ........................................................................................................... 6 3.0 Identification of Need for Improvements to Alleviate or Minimize Existing Hazards ........................................................................................................................................ 7 3.1 Local Assets ....................................................................................................................................... 7 3.2 Non-local Assets and Public Benefit .................................................................................................. -
Bio-Preservation Potential of Sediment in Eberswalde Crater, Mars
Western Washington University Western CEDAR WWU Graduate School Collection WWU Graduate and Undergraduate Scholarship Fall 2020 Bio-preservation Potential of Sediment in Eberswalde crater, Mars Cory Hughes Western Washington University, [email protected] Follow this and additional works at: https://cedar.wwu.edu/wwuet Part of the Geology Commons Recommended Citation Hughes, Cory, "Bio-preservation Potential of Sediment in Eberswalde crater, Mars" (2020). WWU Graduate School Collection. 992. https://cedar.wwu.edu/wwuet/992 This Masters Thesis is brought to you for free and open access by the WWU Graduate and Undergraduate Scholarship at Western CEDAR. It has been accepted for inclusion in WWU Graduate School Collection by an authorized administrator of Western CEDAR. For more information, please contact [email protected]. Bio-preservation Potential of Sediment in Eberswalde crater, Mars By Cory M. Hughes Accepted in Partial Completion of the Requirements for the Degree Master of Science ADVISORY COMMITTEE Dr. Melissa Rice, Chair Dr. Charles Barnhart Dr. Brady Foreman Dr. Allison Pfeiffer GRADUATE SCHOOL David L. Patrick, Dean Master’s Thesis In presenting this thesis in partial fulfillment of the requirements for a master’s degree at Western Washington University, I grant to Western Washington University the non-exclusive royalty-free right to archive, reproduce, distribute, and display the thesis in any and all forms, including electronic format, via any digital library mechanisms maintained by WWU. I represent and warrant this is my original work, and does not infringe or violate any rights of others. I warrant that I have obtained written permissions from the owner of any third party copyrighted material included in these files. -
Northern San Francisco Bay Ecological Risk Assessment: Potential Crude by Rail Incident Meagan Bowis University of San Francisco, [email protected]
The University of San Francisco USF Scholarship: a digital repository @ Gleeson Library | Geschke Center Master's Projects and Capstones Theses, Dissertations, Capstones and Projects Spring 5-20-2016 Northern San Francisco Bay Ecological Risk Assessment: Potential Crude by Rail Incident Meagan Bowis University of San Francisco, [email protected] Follow this and additional works at: https://repository.usfca.edu/capstone Part of the Environmental Health and Protection Commons, Environmental Indicators and Impact Assessment Commons, Natural Resource Economics Commons, Natural Resources Management and Policy Commons, Oil, Gas, and Energy Commons, and the Other Oceanography and Atmospheric Sciences and Meteorology Commons Recommended Citation Bowis, Meagan, "Northern San Francisco Bay Ecological Risk Assessment: Potential Crude by Rail Incident" (2016). Master's Projects and Capstones. 340. https://repository.usfca.edu/capstone/340 This Project/Capstone is brought to you for free and open access by the Theses, Dissertations, Capstones and Projects at USF Scholarship: a digital repository @ Gleeson Library | Geschke Center. It has been accepted for inclusion in Master's Projects and Capstones by an authorized administrator of USF Scholarship: a digital repository @ Gleeson Library | Geschke Center. For more information, please contact [email protected]. This Master’s Project Northern San Francisco Bay Ecological Risk Assessment: Potential Crude by Rail Incident By Meagan Kane Bowis is submitted in partial fulfillment of the requirements -
Water Resource Competition in the Brahmaputra River Basin: China, India, and Bangladesh Nilanthi Samaranayake, Satu Limaye, and Joel Wuthnow
Water Resource Competition in the Brahmaputra River Basin: China, India, and Bangladesh Nilanthi Samaranayake, Satu Limaye, and Joel Wuthnow May 2016 Distribution unlimited This document represents the best opinion of CNA at the time of issue. Distribution Distribution unlimited. Specific authority contracting number: 14-106755-000-INP. For questions or comments about this study, contact Nilanthi Samaranayake at [email protected] Cover Photography: Brahmaputra River, India: people crossing the Brahmaputra River at six in the morning. Credit: Encyclopædia Britannica ImageQuest, "Brahmaputra River, India," Maria Stenzel / National Geographic Society / Universal Images Group Rights Managed / For Education Use Only, http://quest.eb.com/search/137_3139899/1/137_3139899/cite. Approved by: May 2016 Ken E Gause, Director International Affairs Group Center for Strategic Studies Copyright © 2016 CNA Abstract The Brahmaputra River originates in China and runs through India and Bangladesh. China and India have fought a war over contested territory through which the river flows, and Bangladesh faces human security pressures in this basin that will be magnified by upstream river practices. Controversial dam-building activities and water diversion plans could threaten regional stability; yet, no bilateral or multilateral water management accord exists in the Brahmaputra basin. This project, sponsored by the MacArthur Foundation, provides greater understanding of the equities and drivers fueling water insecurity in the Brahmaputra River basin. After conducting research in Dhaka, New Delhi, and Beijing, CNA offers recommendations for key stakeholders to consider at the subnational, bilateral, and multilateral levels to increase cooperation in the basin. These findings lay the foundation for policymakers in China, India, and Bangladesh to discuss steps that help manage and resolve Brahmaputra resource competition, thereby strengthening regional security. -
Possible Evaporite Karst in an Interior Layered Deposit in Juventae
International Journal of Speleology 46 (2) 181-189 Tampa, FL (USA) May 2017 Available online at scholarcommons.usf.edu/ijs International Journal of Speleology Off icial Journal of Union Internationale de Spéléologie Possible evaporite karst in an interior layered deposit in Juventae Chasma, Mars Davide Baioni* and Mario Tramontana Planetary Geology Research Group, Dipartimento di Scienze Pure e Applicate (DiSPeA), Università degli Studi di Urbino "Carlo Bo", Campus Scientifico Enrico Mattei, 61029 Urbino (PU), Italy Abstract: This paper describes karst landforms observed in an interior layered deposit (ILD) located within Juventae Chasma a trough of the Valles Marineris, a rift system that belongs to the Tharsis region of Mars. The ILD investigated is characterized by spectral signatures of kieserite, an evaporitic mineral present on Earth. A morphologic and morphometric survey of the ILD surface performed on data of the Orbiter High Resolution Imaging Science Experiment (HiRISE) highlighted the presence of depressions of various shapes and sizes. These landforms interpreted as dolines resemble similar karst landforms on Earth and in other regions of Mars. The observed karst landforms suggest the presence of liquid water, probably due to ice melting, in the Amazonian age. Keywords: Mars, interior layered deposits, karst, climate change Received 21 Octomber 2016; Revised 18 April 2017; Accepted 19 April 2017 Citation: Baioni D. and Tramontana M., 2017. Possible evaporite karst in an interior layered deposit in Juventae Chasma, Mars. International Journal of Speleology, 46 (2), 181-189. Tampa, FL (USA) ISSN 0392-6672 https://doi.org/10.5038/1827-806X.46.2.2085 INTRODUCTION north of Valles Marineris (Catling et al., 2006). -
Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA
UC Davis San Francisco Estuary and Watershed Science Title Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA Permalink https://escholarship.org/uc/item/7xd4x0xw Journal San Francisco Estuary and Watershed Science, 8(2) ISSN 1546-2366 Authors Deverel, Steven J Leighton, David A Publication Date 2010 DOI https://doi.org/10.15447/sfews.2010v8iss2art1 Supplemental Material https://escholarship.org/uc/item/7xd4x0xw#supplemental License https://creativecommons.org/licenses/by/4.0/ 4.0 Peer reviewed eScholarship.org Powered by the California Digital Library University of California august 2010 Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA Steven J. Deverel1 and David A. Leighton Hydrofocus, Inc., 2827 Spafford Street, Davis, CA 95618 AbStRACt will range from a few cm to over 1.3 m (4.3 ft). The largest elevation declines will occur in the central To estimate and understand recent subsidence, we col- Sacramento–San Joaquin Delta. From 2007 to 2050, lected elevation and soils data on Bacon and Sherman the most probable estimated increase in volume below islands in 2006 at locations of previous elevation sea level is 346,956,000 million m3 (281,300 ac-ft). measurements. Measured subsidence rates on Sherman Consequences of this continuing subsidence include Island from 1988 to 2006 averaged 1.23 cm year-1 increased drainage loads of water quality constitu- (0.5 in yr-1) and ranged from 0.7 to 1.7 cm year-1 (0.3 ents of concern, seepage onto islands, and decreased to 0.7 in yr-1). Subsidence rates on Bacon Island from arability.