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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Exploring the role of topography in small channel erosion
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Exploring the role of topography in small channel erosion

机译：探索地形在小河道侵蚀中的作用

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摘要

Erosion caused by concentrated flows in agricultural areas is responsible for important soil losses, and rapid sediment transfer through the channel network. The main factors controlling concentrated flow erosion rates include the erodibility of soil materials, soil use and management, climate and watershed topography. In this paper, two topographic indices, closely related to mathematical expressions suggested by different authors, are used to characterize the influence of watershed topography on gully erosion. The AS1 index is defined as the product of the watershed area and the partial area-weighted average slope. The AS2 index is similar to the AS1 but uses the swale slope as the weighting factor. Formally, AS2 is the product of the watershed area and the length-weighted average swale slope. From studies made using different ephemeral gully erosion databases, it is shown that a high correlation consistently exists between the topographic indices and the volume of eroded soil. The resulting relationships are therefore useful to assess soil losses from gully erosion, to identify the most susceptible watersheds within large areas, and to compare the susceptibility to gully, erosion among different catchments. This information is also important in studying the response of natural drainage network systems to different rainfall inputs. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：农业地区集中水流造成的侵蚀是重要的土壤流失，以及通过渠道网络的快速沉积物转移。控制集中水流侵蚀速率的主要因素包括土壤材料的可蚀性，土壤的使用和管理，气候和流域地形。在本文中，两个地形指数与不同作者提出的数学表达式密切相关，用于表征流域地形对沟壑侵蚀的影响。 AS1指数定义为流域面积与局部面积加权平均斜率的乘积。 AS2索引与AS1相似，但是使用swale斜率作为加权因子。形式上，AS2是分水岭面积与长度加权平均sw斜率的乘积。从使用不同的短暂河谷侵蚀数据库进行的研究表明，地形指数与侵蚀土壤的体积之间始终存在高度相关性。因此，由此产生的关系对于评估沟壑侵蚀造成的土壤流失，确定大面积区域内最易受影响的流域以及比较不同集水区对沟壑侵蚀的敏感性非常有用。该信息对于研究自然排水网络系统对不同降雨输入的响应也很重要。版权所有（c）2005 John Wiley＆Sons，Ltd.

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