Identification of prevailing storm runoff generation mechanisms in an intensively cultivated catchment

Journal of Hydrology and Hydromechanics

卷:63

Zumr David¹  Dostál Tomáš¹  Devátý Jan¹ 

[1] Department of Irrigation, Drainage and Landscape Engineering, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 16629, Prague 6, Czech Republic;

关键词: shallow subsurface runoff;    surface runoff;    rainfall-runoff;    soil erosion;    suspended solids transport;    agriculture watershed;   

DOI  :  10.1515/johh-2015-0022

来源: DOAJ

【 摘 要 】

The fact that flash floods initiated in arable catchments are often accompanied by massive sediment and nutrient loads often leads to the assumption that surface runoff is the principle pathway by which runoff reaches watercourses. On the basis of an evaluation of several rainfall-runoff events in a representative agricultural catchment, we show that runoff from cultivated land may be generated in a way similar to that seen on forested slopes, where shallow subsurface runoff is the predominant pathway by which runoff makes its way to watercourses in most runoff events. To identify the predominant runoff pathway, we employed a combination of turbidity measurements and stream discharge data. Suspended sediment flux, a newly introduced index representing the ratio between precipitation duration and total sediment yield, and direction of the discharge-turbidity hysteresis loops were proposed as reflective indicators of the frequency of runoff via different pathways.

【 授权许可】

Unknown