Alphabetical Glossary of Geomorphology
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Surface Mass Balance of Small Glaciers on James Ross Island
Journal of Glaciology (2018), 64(245) 349–361 doi: 10.1017/jog.2018.17 © The Author(s) 2018. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. Surface mass balance of small glaciers on James Ross Island, north-eastern Antarctic Peninsula, during 2009–2015 ̌ ̌ ̌ ZBYNEK ENGEL,1* KAMIL LÁSKA,2 DANIEL NÝVLT,2 ZDENEK STACHON2 1Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Praha, Czech Republic 2Department of Geography, Faculty of Science, Masaryk University, Brno, Czech Republic *Correspondence: Zbyněk Engel <[email protected]> ABSTRACT. Two small glaciers on James Ross Island, the north-eastern Antarctic Peninsula, experi- enced surface mass gain between 2009 and 2015 as revealed by field measurements. A positive cumulative surface mass balance of 0.57 ± 0.67 and 0.11 ± 0.37 m w.e. was observed during the 2009–2015 period on Whisky Glacier and Davies Dome, respectively. The results indicate a change from surface mass loss that prevailed in the region during the first decade of the 21st century to predominantly positive surface mass balance after 2009/10. The spatial pattern of annual surface mass-balance distribution implies snow redistribution by wind on both glaciers. The mean equilibrium line altitudes for Whisky Glacier (311 ± 16 m a.s.l.) and Davies Dome (393 ± 18 m a.s.l.) are in accordance with the regional data indicating 200–300 m higher equilibrium line on James Ross and Vega Islands compared with the South Shetland Islands. -
Basal Control of Supraglacial Meltwater Catchments on the Greenland Ice Sheet
The Cryosphere, 12, 3383–3407, 2018 https://doi.org/10.5194/tc-12-3383-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Basal control of supraglacial meltwater catchments on the Greenland Ice Sheet Josh Crozier1, Leif Karlstrom1, and Kang Yang2,3 1University of Oregon Department of Earth Sciences, Eugene, Oregon, USA 2School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China 3Joint Center for Global Change Studies, Beijing 100875, China Correspondence: Josh Crozier ([email protected]) Received: 5 April 2018 – Discussion started: 17 May 2018 Revised: 13 October 2018 – Accepted: 15 October 2018 – Published: 29 October 2018 Abstract. Ice surface topography controls the routing of sur- sliding regimes. Predicted changes to subglacial hydraulic face meltwater generated in the ablation zones of glaciers and flow pathways directly caused by changing ice surface to- ice sheets. Meltwater routing is a direct source of ice mass pography are subtle, but temporal changes in basal sliding or loss as well as a primary influence on subglacial hydrology ice thickness have potentially significant influences on IDC and basal sliding of the ice sheet. Although the processes spatial distribution. We suggest that changes to IDC size and that determine ice sheet topography at the largest scales are number density could affect subglacial hydrology primarily known, controls on the topographic features that influence by dispersing the englacial–subglacial input of surface melt- meltwater routing at supraglacial internally drained catch- water. ment (IDC) scales ( < 10s of km) are less well constrained. Here we examine the effects of two processes on ice sheet surface topography: transfer of bed topography to the surface of flowing ice and thermal–fluvial erosion by supraglacial 1 Introduction meltwater streams. -
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. -
Geomorphological Change and River Rehabilitation Alterra Is the Main Dutch Centre of Expertise on Rural Areas and Water Management
Geomorphological Change and River Rehabilitation Alterra is the main Dutch centre of expertise on rural areas and water management. It was founded 1 January 2000. Alterra combines a huge range of expertise on rural areas and their sustainable use, including aspects such as water, wildlife, forests, the environment, soils, landscape, climate and recreation, as well as various other aspects relevant to the development and management of the environment we live in. Alterra engages in strategic and applied research to support design processes, policymaking and management at the local, national and international level. This includes not only innovative, interdisciplinary research on complex problems relating to rural areas, but also the production of readily applicable knowledge and expertise enabling rapid and adequate solutions to practical problems. The many themes of Alterra’s research effort include relations between cities and their surrounding countryside, multiple use of rural areas, economy and ecology, integrated water management, sustainable agricultural systems, planning for the future, expert systems and modelling, biodiversity, landscape planning and landscape perception, integrated forest management, geoinformation and remote sensing, spatial planning of leisure activities, habitat creation in marine and estuarine waters, green belt development and ecological webs, and pollution risk assessment. Alterra is part of Wageningen University and Research centre (Wageningen UR) and includes two research sites, one in Wageningen and one on the island of Texel. Geomorphological Change and River Rehabilitation Case Studies on Lowland Fluvial Systems in the Netherlands H.P. Wolfert ALTERRA SCIENTIFIC CONTRIBUTIONS 6 ALTERRA GREEN WORLD RESEARCH, WAGENINGEN 2001 This volume was also published as a PhD Thesis of Utrecht University Promotor: Prof. -
Glacier (And Ice Sheet) Mass Balance
Glacier (and ice sheet) Mass Balance The long-term average position of the highest (late summer) firn line ! is termed the Equilibrium Line Altitude (ELA) Firn is old snow How an ice sheet works (roughly): Accumulation zone ablation zone ice land ocean • Net accumulation creates surface slope Why is the NH insolation important for global ice• sheetSurface advance slope causes (Milankovitch ice to flow towards theory)? edges • Accumulation (and mass flow) is balanced by ablation and/or calving Why focus on summertime? Ice sheets are very sensitive to Normal summertime temperatures! • Ice sheet has parabolic shape. • line represents melt zone • small warming increases melt zone (horizontal area) a lot because of shape! Slightly warmer Influence of shape Warmer climate freezing line Normal freezing line ground Furthermore temperature has a powerful influence on melting rate Temperature and Ice Mass Balance Summer Temperature main factor determining ice growth e.g., a warming will Expand ablation area, lengthen melt season, increase the melt rate, and increase proportion of precip falling as rain It may also bring more precip to the region Since ablation rate increases rapidly with increasing temperature – Summer melting controls ice sheet fate* – Orbital timescales - Summer insolation must control ice sheet growth *Not true for Antarctica in near term though, where it ʼs too cold to melt much at surface Temperature and Ice Mass Balance Rule of thumb is that 1C warming causes an additional 1m of melt (see slope of ablation curve at right) -
How Do Upwelling and El Niño Impact Coral Reef Growth? a Guided, Inquiry-Based Lesson
OceTHE OFFICIALa MAGAZINEn ogOF THE OCEANOGRAPHYra SOCIETYphy CITATION Gravinese, P.M., L.T. Toth, C.J. Randall, and R.B. Aronson. 2018. How do upwelling and El Niño impact coral reef growth? A guided, inquiry-based lesson. Oceanography 31(4):184–188, https://doi.org/10.5670/oceanog.2018.424. DOI https://doi.org/10.5670/oceanog.2018.424 PERMISSIONS Oceanography (ISSN 1042-8275) is published by The Oceanography Society, 1 Research Court, Suite 450, Rockville, MD 20850 USA. ©2018 The Oceanography Society, Inc. Permission is granted for individuals to read, download, copy, distribute, print, search, and link to the full texts of Oceanography articles. Figures, tables, and short quotes from the magazine may be republished in scientific books and journals, on websites, and in PhD dissertations at no charge, but the materi- als must be cited appropriately (e.g., authors, Oceanography, volume number, issue number, page number[s], figure number[s], and DOI for the article). Republication, systemic reproduction, or collective redistribution of any material in Oceanography is permitted only with the approval of The Oceanography Society. Please contact Jennifer Ramarui at [email protected]. Permission is granted to authors to post their final pdfs, provided byOceanography , on their personal or institutional websites, to deposit those files in their institutional archives, and to share the pdfs on open-access research sharing sites such as ResearchGate and Academia.edu. DOWNLOADED FROM HTTPS://TOS.ORG/OCEANOGRAPHY HANDS-ON OCEANOGRAPHY How Do Upwelling and El Niño Impact Coral Reef Growth? A GUIDED, INQUIRY-BASED LESSON By Philip M. Gravinese, Lauren T. Toth, Carly J. -
Icing Mound on Sadlerochit River, Alaska
Short Papers and Notes ICING MOUND ON SADLERO- Sadlerochithas emerged from the CHIT RIVER, ALASKA* mountains, has arelatively low gra- dient and flows in a broad, braided bed Icing mounds- small to large domes, characterized by manyanastomosing mounds,and ridges resulting from an shallowchannels separated by bare, upwardarching of soiland ice asso- gravelly and bouldery bars (Fig. 2). AS ciated with fields of aufeis - have been is characteristic of all riversof the Arc- described in detailfor Siberia1. Icing tic Slope, the change from a single deep mounds have also been mentioned brief- channel to a braided pattern of many ly inconnection with aufeisfields in shallow channels allows the formation Alaskaby Leffigwell (ref. 2, p. 158) of an aufeis field every year near the and Taber (ref. 3, p. 1528; ref. 4, p. 249), mountain front. During the fall the but there is little descriptive literature shallow channels freeze early and the on this phenomenon in theNorth Amer- obstruction of the resulting ice causes ican Arctic. One such icing mound was the river to overflow its bars;this over- examined briefly by the author on June flow then freezes and by repeated freez- 25,1959 during the course of a trip down ing,overflow and freezingsuccessive the SadlerochitRiver in northeastern layers of ice are built up toform an Alaska (Fig. 1). aufeis field. Another factor contributing Fig. 1. Locationmap, Arctic Slope, Alaska. The SadlerochitRiver rises in the to the formation of large aufeis fields is Franklin Mountains of the eastern a source of water that persists for some Brooks Range and flows northwardin a time after freezingbegins. -
3.13 Paleontological Resources
Gateway West Transmission Line Draft EIS 3.13 PALEONTOLOGICAL RESOURCES This section addresses the potential impacts from the Proposed Route and Route Alternatives on the known paleontological resources during construction, operation, and decommissioning. The Proposed Route and Route Alternatives pass through areas where paleontological resources are known to exist. The routes, their potential impacts, and mitigation methods to minimize or eliminate impacts are discussed in this section. 3.13.1 Affected Environment This section describes the mapped geology and known paleontological resources near the Proposed Action. It also describes and compares potential impacts of the Proposed Action and Action Alternatives to paleontological resources. Fossils are important scientific and educational resources because of their use in: 1) documenting the presence and evolutionary history of particular groups of now extinct organisms, 2) reconstructing the environments in which these organisms lived, and 3) determining the relative ages of the strata in which they occur. Fossils are also important in determining the geologic events that resulted in the deposition of the sediments in which they were buried. 3.13.1.1 Analysis Area The Project area in Wyoming and Idaho consists of predominantly north-south trending mountain ranges separated by structural basins. The eastern portion of the Project (Segments 1 and 2) would be located within the Laramie Mountains and the Shirley Mountains, which consist predominantly of Precambrian granite and gneisses. Moving west in Wyoming, the Project would cross major structural basins created during the Laramide Orogeny, including the Hanna Basin in Carbon County (Segment 2), and the Greater Green River Basin in Sweetwater County (Segments 3 and 4). -
The Roles of Endolithic Fungi in Bioerosion and Disease in Marine Ecosystems. II. Potential Facultatively Parasitic Anamorphic A
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by University of Dundee Online Publications University of Dundee The roles of endolithic fungi in bioerosion and disease in marine ecosystems. II. Potential facultatively parasitic anamorphic ascomycetes can cause disease in corals and molluscs Gleason, Frank H.; Gadd, Geoffrey M.; Pitt, John I.; Larkum, Anthony W.D. Published in: Mycology DOI: 10.1080/21501203.2017.1371802 Publication date: 2017 Document Version Publisher's PDF, also known as Version of record Link to publication in Discovery Research Portal Citation for published version (APA): Gleason, F. H., Gadd, G. M., Pitt, J. I., & Larkum, A. W. D. (2017). The roles of endolithic fungi in bioerosion and disease in marine ecosystems. II. Potential facultatively parasitic anamorphic ascomycetes can cause disease in corals and molluscs. Mycology, 8(3), 216-227. https://doi.org/10.1080/21501203.2017.1371802 General rights Copyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain. • You may freely distribute the URL identifying the publication in the public portal. Mycology An International Journal on Fungal Biology ISSN: 2150-1203 (Print) 2150-1211 (Online) Journal homepage: http://www.tandfonline.com/loi/tmyc20 The roles of endolithic fungi in bioerosion and disease in marine ecosystems. -
Historical and Recent Aufeis, the Indigirka River Basin (Russia)
1 Historical and recent aufeis, the Indigirka river basin 2 (Russia) 3 *Olga Makarieva1,2,, Andrey Shikhov3, Nataliia Nesterova2,4, Andrey Ostashov2 4 1Melnikov Permafrost Institute of RAS, Yakutsk 5 2St. Petersburg State University, St. Petersburg 6 3Perm State University, Perm 7 4State Hydrological institute, St. Petersburg 8 RUSSIA 9 *[email protected] 10 Abstract: A detailed spatial geodatabase of aufeis (or naleds in Russian) within the 11 Indigirka River watershed (305 000 km2), Russia, was compiled from historical Russian 12 publications (year 1958), topographic maps (years 1970–1980’s), and Landsat images (year 13 2013-2017). Identification of aufeis by late-spring Landsat images was performed with a semi- 14 automated approach according to Normalized Difference Snow Index (NDSI) and additional 15 data. After this, a cross-reference index was set for each aufeis, to link and compare historical 16 and satellite-based aufeis data sets. 17 The aufeis coverage varies from 0.26 to 1.15% in different sub-basins within the 18 Indigirka River watershed. The digitized historical archive (Cadastre, 1958) contains the 19 coordinates and characteristics of 896 aufeis with total area of 2064 km2. The Landsat-based 20 dataset included 1213 aufeis with a total area of 1287 km2. Accordingly, the satellite-derived 21 total aufeis area is 1.6 times less than the Cadastre (1958) dataset. However, more than 600 22 aufeis identified from Landsat images are missing in the Cadastre (1958) archive. It is 23 therefore possible that the conditions for aufeis formation may have changed from the mid- 24 20th century to the present. -
Part 629 – Glossary of Landform and Geologic Terms
Title 430 – National Soil Survey Handbook Part 629 – Glossary of Landform and Geologic Terms Subpart A – General Information 629.0 Definition and Purpose This glossary provides the NCSS soil survey program, soil scientists, and natural resource specialists with landform, geologic, and related terms and their definitions to— (1) Improve soil landscape description with a standard, single source landform and geologic glossary. (2) Enhance geomorphic content and clarity of soil map unit descriptions by use of accurate, defined terms. (3) Establish consistent geomorphic term usage in soil science and the National Cooperative Soil Survey (NCSS). (4) Provide standard geomorphic definitions for databases and soil survey technical publications. (5) Train soil scientists and related professionals in soils as landscape and geomorphic entities. 629.1 Responsibilities This glossary serves as the official NCSS reference for landform, geologic, and related terms. The staff of the National Soil Survey Center, located in Lincoln, NE, is responsible for maintaining and updating this glossary. Soil Science Division staff and NCSS participants are encouraged to propose additions and changes to the glossary for use in pedon descriptions, soil map unit descriptions, and soil survey publications. The Glossary of Geology (GG, 2005) serves as a major source for many glossary terms. The American Geologic Institute (AGI) granted the USDA Natural Resources Conservation Service (formerly the Soil Conservation Service) permission (in letters dated September 11, 1985, and September 22, 1993) to use existing definitions. Sources of, and modifications to, original definitions are explained immediately below. 629.2 Definitions A. Reference Codes Sources from which definitions were taken, whole or in part, are identified by a code (e.g., GG) following each definition. -
Experiments on Patterns of Alluvial Cover and Bedrock Erosion in a Meandering Channel Roberto Fernández1, Gary Parker1,2, Colin P
Earth Surf. Dynam. Discuss., https://doi.org/10.5194/esurf-2019-8 Manuscript under review for journal Earth Surf. Dynam. Discussion started: 27 February 2019 c Author(s) 2019. CC BY 4.0 License. Experiments on patterns of alluvial cover and bedrock erosion in a meandering channel Roberto Fernández1, Gary Parker1,2, Colin P. Stark3 1Ven Te Chow Hydrosystems Laboratory, Department of Civil and Environmental Engineering, University of Illinois at 5 Urbana-Champaign, Urbana, IL 61801, USA 2Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA 3Lamont Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA Correspondence to: Roberto Fernández ([email protected]) Abstract. 10 In bedrock rivers, erosion by abrasion is driven by sediment particles that strike bare bedrock while traveling downstream with the flow. If the sediment particles settle and form an alluvial cover, this mode of erosion is impeded by the protection offered by the grains themselves. Channel erosion by abrasion is therefore related to the amount and pattern of alluvial cover, which are functions of sediment load and hydraulic conditions, and which in turn are functions of channel geometry, slope and sinuosity. This study presents the results of alluvial cover experiments conducted in a meandering channel flume of high fixed 15 sinuosity. Maps of quasi-instantaneous alluvial cover were generated from time-lapse imaging of flows under a range of below- capacity bedload conditions. These maps were used to infer patterns