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פותח על ידי קלירמאש פתרונות בע"מ -
Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform
Year:
2018
Source of publication :
Water Resources Research
Authors :
אסולין, שמואל
;
.
Volume :
54
Co-Authors:

Wu, S., Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, China, Institute of Earth Surface System and Hazards, Northwest University, Xi'an, China; Chen, L., Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV, United States; Wang, N., Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, China, Institute of Earth Surface System and Hazards, Northwest University, Xi'an, China; Yu, M., State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China;

Facilitators :
From page:
10117
To page:
10133
(
Total pages:
17
)
Abstract:

The effect of rill network planforms on hillslope rainfall-runoff and soil erosion processes is usually neglected in modeling practices, although they can markedly alter the hydrologic and geomorphic processes. Based on the CeRIRM model and WEPP erosion theory, a simple approach is developed to account for these effects. In the framework, several characteristic parameters including the average rill width, rill orientation angle, the number of rills, and number of discontinuous rills and their variations along the hillslope are introduced to represent the planar characteristics of the rill network. The model is tested against experimental erosion data from a hillslope subjected to three successive rainfall events, resulting in continuous rill network evolution. The results show that rill network planforms alter the partitioning of interrill and rill flows, thereby modifying the hydraulics, erosion, and sedimentation in the rills. Rill characteristics are found to significantly affect the amount of rill erosion. The new approach is compared to WEPP, which ignores rill network features. The WEPP approach of simulating rill erosion on hillslopes using one set of model parameters leads to errors that are up to 30% larger than the new approach that is able to account for spatially and temporally varying rill characteristics. The differences in cumulative rill erosion amounts between the two models vary significantly with slope length, slope angle, rill orientation angle, number of rills, and discontinuous rills. The results are valuable for the development of general rainfall-runoff and soil erosion models on hillslopes with complex geomorphic features. ©2018. American Geophysical Union. All Rights Reserved.

Note:
Related Files :
Complex networks
Erosion
hillslope
Hillslopes
rain
rainfall-runoff
runoff
Soils
עוד תגיות
תוכן קשור
More details
DOI :
10.1029/2018WR023837
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:

10,117-10,133

ID:
38891
Last updated date:
02/03/2022 17:27
Creation date:
06/01/2019 13:52
Scientific Publication
Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform
54

Wu, S., Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, China, Institute of Earth Surface System and Hazards, Northwest University, Xi'an, China; Chen, L., Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV, United States; Wang, N., Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, China, Institute of Earth Surface System and Hazards, Northwest University, Xi'an, China; Yu, M., State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China;

Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform

The effect of rill network planforms on hillslope rainfall-runoff and soil erosion processes is usually neglected in modeling practices, although they can markedly alter the hydrologic and geomorphic processes. Based on the CeRIRM model and WEPP erosion theory, a simple approach is developed to account for these effects. In the framework, several characteristic parameters including the average rill width, rill orientation angle, the number of rills, and number of discontinuous rills and their variations along the hillslope are introduced to represent the planar characteristics of the rill network. The model is tested against experimental erosion data from a hillslope subjected to three successive rainfall events, resulting in continuous rill network evolution. The results show that rill network planforms alter the partitioning of interrill and rill flows, thereby modifying the hydraulics, erosion, and sedimentation in the rills. Rill characteristics are found to significantly affect the amount of rill erosion. The new approach is compared to WEPP, which ignores rill network features. The WEPP approach of simulating rill erosion on hillslopes using one set of model parameters leads to errors that are up to 30% larger than the new approach that is able to account for spatially and temporally varying rill characteristics. The differences in cumulative rill erosion amounts between the two models vary significantly with slope length, slope angle, rill orientation angle, number of rills, and discontinuous rills. The results are valuable for the development of general rainfall-runoff and soil erosion models on hillslopes with complex geomorphic features. ©2018. American Geophysical Union. All Rights Reserved.

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