Stream Dymanics. Channel Processes | WARSSS. Sediment & River Stability Transport physics, sediment size, sediment load, increases in the magnitude and duration of stream flow, stability of stream banks and bed all influence the contribution of sediment from channel processes. The hillslope processes reflect the potential sediment delivered to the channel. How the stream accommodates delivered sediment is then dependent on the particle size and magnitude of the delivered sediment load as well as the river competence and capacity. Measurements of suspended and bedload sediment are not routinely obtained, thus the amount of data is limited throughout the United States. To General Principles Home Page | Go to Bedload Transport. Investigating Stream Channel Morphology Using a Geographic Information System.
Scott N. Miller, D. Phillip Guertin, and David C. Goodrich Abstract Technical issues and time constraints have historically made it prohibitive to complete geomorphologic analyses on relatively large and complex study areas. With the advent of geographic information systems (GIS), quantitative analyses necessary for watershed and hydrologic modeling could be carried out rapidly and accurately, allowing for the construction and execution of large-scale geomorphologic investigations. ARC Macro Language (AML) routines were created to aid in the derivation of subwatershed boundaries and in characterizing areas contributing runoff to each of the 222 sample points randomly located on Walnut Gulch. Study Site Description Located in southeastern Arizona, the vegetation of Walnut Gulch Experimental Watershed is characterized as scrub-grassland. The climate of Walnut Gulch has been classified as semiarid or steppe. GIS Database Development Channel Network Field Data Collection GIS Analysis Results D.
Preview - Scopus - Document details. Catena Volume 73, Issue 3, 15 May 2008, Pages 249-260 Cavalli, M.a , Tarolli, P.b, Marchi, L.a, Dalla Fontana, G.b Retrieving additional authors... a CNR-IRPI, Corso Stati Uniti 4, 35127 Padova, Italyb Department of Land, Agroforest Environments University of Padova, Agripolis, viale dell'Universita 16, 35020 Legnaro, PD, Italy Retrieving additional affiliations...
Abstract High-resolution topographic data have the potential to differentiate the main morphological features of a landscape. Author keywords Channel-bed morphology; DTM; LiDAR; Step pools; Surface roughness Indexed keywords GEOBASE Subject Index: bedform; catchment; channel; digital terrain model; elevation; geomorphology; lidar ISSN: 03418162CODEN: CIJPDSource Type: JournalOriginal language: English. Journal of Hydrology - Stream classification using hierarchical artificial neural networks: A fluvial hazard management tool.
Summary Watershed managers and planners have long sought decision-making tools for forecasting changes in stream-channels over large spatial and temporal scales. In this research, we apply non-parametric, clustering and classification artificial neural networks to assimilate large amounts of disparate data types for use in fluvial hazard management decision-making. Two types of artificial neural networks (a counterpropagation algorithm and a Kohonen self-organizing map) are used in hierarchy to predict reach-scale stream geomorphic condition, inherent vulnerability and sensitivity to adjustments using expert knowledge in combination with a variety of geomorphic assessment field data. Seven hundred and eighty-nine Vermont stream reaches (+7500 km) have been assessed by the Vermont Agency of Natural Resources’ geomorphic assessment protocols, and are used in the development of this work.
Keywords Copyright © 2009 Elsevier B.V. Channel Migration Assessment. Step 1b, Task 1: Map the channel gradient The Washington Department of Fish and Wildlife (WDFW) interactive mapping site, Salmonscape, provides channel gradient maps for all Washington streams. The stream gradient attribute data can be downloaded by County or smaller area as GIS Shapefiles (Figure 1 below). Is gradient ≤4%? Click to go to Task 2. To look for evidence of channel change. Step 1b, Task 2: Is the channel confined? Channel confinement is the ratio of valley width to active channel width. Valley width is measured from toe of hillslope on both sides of the river. Evaluate channel confinement using existing data sources (see Table 1). Figure 2: Confinement can be determined from topographic maps. Is channel confinement moderate to unconfined or is the valley floor obviously more than twice as wide as the active channel?
To Step1B, Task 3. Additional information on channel gradient and confinement Figure 3: Channel confinement and gradient can be an indicator of migration potential. Landforms on Topographic Maps. Scope 35 - Scales and Global Change, Chapter 12, Variability of the Fluvial System in Space and Time. The fluvial system is a process-response system that includes the morphologic component of channels, floodplains, hill slopes, and the cascading component of water and sediment.
The system changes progressively through geologic time, as a result of normal erosional and depositional processes, and it responds to changes of climate, baselevel, and tectonics. Therefore, there can be considerable variability of fluvial system morphology and dynamics through time. In addition, there is great variability in space or location as a result of different geologic, climatic, and relief conditions. The prediction and postdiction of fluvial system behaviour is greatly complicated by this variability, and there are seven potential problems that must be considered in any attempt to extrapolate empirical relations in space and time. The term fluvial is from the Latin word fluvius, a river. Each zone, as defined above, is an open system. Table 12.1 Fluvial System Variables (from Schumm and Lichty, 1965) Influence of catchment processes on fluvial morphology and river habitats | Askoa Ibisate.
Limnetica, 29 (2): x-xx (2011)Limnetica, 30 (2): 169-182 (2011) c Asociaci´on Ib´erica de Limnolog´ ı a, Madrid. Spain. ISSN: 0213-8409 In fl uence of catchment processes on uvial morphology and riverhabitats Askoa Ibisate , Alfredo Ollero and Elena D´ az Section of Physical Geography, Dept. of Geography, Prehistory and Archaeology, University of BasqueCountry, Tom´as y Valiente s/n, 01006 Vitoria-Gasteiz.
Section of Physical Geography, Dept. of Geography and Land Management, University of Zaragoza, PedroCerbuna s/n, 50009 Zaragoza. Corresponding author: askoa.ibisate@ehu.es Received: 18/3/2010 Accepted: 8/2/2011 ABSTRACTIn uvial morphology and river habitats Fluvial morphology is conditioned by three basic elements: ow regime, sediment yield and valley characteristics. Uence of human activities has to be considered as they presently constitute one of the main hydromorphologicalfactors. Uvial geomorphology is a key element in river ecosystems that creates geodiversity and heterogeneity of Keywords: a uviales.
Lane's relation, modified Lane relation, fluvial hydraulics, fluvial geomorphology, erosion and sedimentation, Victor Miguel Ponce.
Theory. Hydrology. Mining related. Geomorph impact papers.