Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR023837 |
Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform | |
Wu, Songbai1,2; Chen, Li3; Wang, Ninglian1,2; Yu, Minghui4; Assouline, Shmuel5 | |
2018-12-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:12页码:10117-10133 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; Israel |
英文摘要 | 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. Plain Language Summary Rill erosion is one of the main forms of soil erosion and is associated with fast flowing water in networks of small channels, that is, rills. Modeling rill erosion is an important yet challenging task informing soil conservation. Although actual rill networks are usually composed of irregular, tortuous, and even discontinuous rills, using parallel and straight rills to simplify the actual rill network is still the prevailing method in current models. This study demonstrates the impact of the irregular planform of rill network on soil erosion and proposes a simple and effective conceptualization to represent complex rill networks using only a few parameters, including rill orientation angle, number of rills, and number of discontinuous rills. The approach can better represent the spatially intricate partitioning of interrill and rill flow and improve the modeling of rill hydraulics, erosion, and sedimentation prediction. Owing to its improved physical basis, the proposed approach simulates both the total amount and the spatial distribution of erosion with improved accuracy. The results of this study are expected to help improve general rainfall-runoff and soil erosion models for hillslopes with complex geomorphic features, and benefit other scientific fields involving transport through complex rill networks. |
英文关键词 | hillslope rainfall-runoff erosion rill network planar characteristics WEPP |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456949300006 |
WOS关键词 | SEDIMENT TRANSPORT ; INTERRILL EROSION ; SIMULATED RAINFALL ; SLOPE ; INFILTRATION ; SCALE ; EVENT ; AREA ; REDISTRIBUTION ; INITIATION |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21794 |
专题 | 资源环境科学 |
作者单位 | 1.Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Car, Xian, Shaanxi, Peoples R China; 2.Northwest Univ, Inst Earth Surface Syst & Hazards, Xian, Shaanxi, Peoples R China; 3.Desert Res Inst, Div Hydrol Sci, Las Vegas, NV 89119 USA; 4.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan, Hubei, Peoples R China; 5.ARO, Inst Soil Water & Environm Sci, Volcani Ctr, Rishon Leziyyon, Israel |
推荐引用方式 GB/T 7714 | Wu, Songbai,Chen, Li,Wang, Ninglian,et al. Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform[J]. WATER RESOURCES RESEARCH,2018,54(12):10117-10133. |
APA | Wu, Songbai,Chen, Li,Wang, Ninglian,Yu, Minghui,&Assouline, Shmuel.(2018).Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform.WATER RESOURCES RESEARCH,54(12),10117-10133. |
MLA | Wu, Songbai,et al."Modeling Rainfall-Runoff and Soil Erosion Processes on Hillslopes With Complex Rill Network Planform".WATER RESOURCES RESEARCH 54.12(2018):10117-10133. |
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