DEM-based numerical modelling of runoff and soil erosion processes in the hilly–gully loess regions |
| |
Authors: | Tao Yang Chong-yu Xu Qiang Zhang Zhongbo Yu Alexander Baron Xiaoyan Wang Vijay P Singh |
| |
Institution: | (1) State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, CAS, 818, Road BeijingNan, Urumqi, Xinjiang, 830011, The People’s Republic of China;(2) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China;(3) Department of Geosciences, University of Oslo, Blindern, P.O. Box 1047, Oslo, 0316, Norway;(4) Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, 510275, China;(5) Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV 89154-4010, USA;(6) Department of Biological and Agricultural Engineering, Texas A & M University, College Station, TX 77843-2117, USA |
| |
Abstract: | For sake of improving our current understanding on soil erosion processes in the hilly–gully loess regions of the middle Yellow
River basin in China, a digital elevation model (DEM)-based runoff and sediment processes simulating model was developed.
Infiltration excess runoff theory was used to describe the runoff generation process while a kinematic wave equation was solved
using the finite-difference technique to simulate concentration processes on hillslopes. The soil erosion processes were modelled
using the particular characteristics of loess slope, gully slope, and groove to characterize the unique features of steep
hillslopes and a large variety of gullies based on a number of experiments. The constructed model was calibrated and verified
in the Chabagou catchment, located in the middle Yellow River of China and dominated by an extreme soil-erosion rate. Moreover,
spatio-temporal characterization of the soil erosion processes in small catchments and in-depth analysis between discharge
and sediment concentration for the hyper-concentrated flows were addressed in detail. Thereafter, the calibrated model was
applied to the Xingzihe catchment, which is dominated by similar soil erosion processes in the Yellow River basin. Results
indicate that the model is capable of simulating runoff and soil erosion processes in such hilly–gully loess regions. The
developed model are expected to contribute to further understanding of runoff generation and soil erosion processes in small
catchments characterized by steep hillslopes, a large variety of gullies, and hyper-concentrated flow, and will be beneficial
to water and soil conservation planning and management for catchments dealing with serious water and soil loss in the Loess
Plateau. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|