Hydrological structure and erosion damage caused by concentrated flow in cultivated catchments
| Autor: | Anne-Véronique Auzet, Jean Boiffin, Bruno Ludwig, Joël Chad˦uf |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Zero order
Hydrology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Flow (psychology) Drainage basin 04 agricultural and veterinary sciences 15. Life on land Structural basin 01 natural sciences 6. Clean water Catchment scale Rill 040103 agronomy & agriculture Erosion 0401 agriculture forestry and fisheries Environmental science Surface runoff 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | CATENA. 25:227-252 |
| ISSN: | 0341-8162 |
| DOI: | 10.1016/0341-8162(95)00012-h |
| Popis: | This study analyses the between-catchment variability of rill volumes produced by concentrated flow erosion during winter in the northern part of the Paris Basin. The working hypotheses were that (i) runoff concentrates along channels determined by topography or by agricultural practices; (ii) rill length is a major component of rill volume variability on a catchment scale; (iii) rill cross-sectional areas are controlled by the size of upslope runoff-contributing areas connected to the corresponding channels. Two samples, one of 20 zero order catchments and the other of 15 catchments, were surveyed. For each catchment, the runoff collector network was modelled from topographical and agricultural information, and split into homogeneous segments. Each segment was characterized by its slope gradient (SL), the soil susceptibility to rill erosion (SSE) and the size of the upslope runoff-contributing areas (RCA) connected to it. These areas were identified by the structural state of their soil surface. The frequency of rill occurrence was highly correlated with RCA and SL. The rill cross-sectional areas of eroded channels were correlated with RCA, SL and SSE. Catchment erosion rates were estimated by adding together the predicted rill volumes for each segment within the catchment. These estimations were closely correlated with observed rill erosion rates. The relative spatial position of runoff collectors must be taken into account when examining the damage caused by concentrated flow erosion. |
| Databáze: | OpenAIRE |
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