Effects of check dam construction on sediment production and topographic changes in a gully in the Loess Plateau: A rainfall simulation experiment

IF 3.2 3区地球科学 Q1 Environmental Science

Hydrological Processes Pub Date : 2024-09-05 DOI:10.1002/hyp.15271

Shaobo Xue, Peng Li, Zhiwei Cui, Zhanbin Li, Zhenzhou Shen

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Abstract

To maintain a reasonable sediment regulation system in the Loess Plateau, it is critical to determine the effects of check dam construction on sediment production and topographic changes. An indoor simulation experiment was conducted to investigate sediment production at the outlet section of the gully and micro-topographic changes within the channel before and after dam construction. The results showed that check dam significantly affected the run-off and sediment transport processes in the watershed. Specifically, the cross-sectional morphology index (η) and the width-depth ratio increased by 10.23% and 40.44%, respectively, while sediment content and particle size decreased by 39.29% and 18.58%, respectively. Additionally, the relative importance of section parameters and micro-topographic parameters that affect sediment production rate and particle size was ranked using the random forest algorithm. The roughness after check dam construction was identified as a relatively important topographic factor affecting sediment production and particle selection by erosion. These findings provide valuable information for future check dam construction and development in the Loess Plateau region.

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拦水坝建设对黄土高原沟谷泥沙产生和地形变化的影响：降雨模拟实验

为了保持黄土高原合理的泥沙调节系统，确定拦水坝建设对泥沙产生和地形变化的影响至关重要。通过室内模拟实验，研究了筑坝前后沟谷出口段的泥沙产生量和沟谷内的微地形变化。结果表明，拦水坝极大地影响了流域内的径流和泥沙输移过程。具体而言，断面形态指数（η）和宽深比分别增加了 10.23% 和 40.44%，而泥沙含量和粒径则分别减少了 39.29% 和 18.58%。此外，还利用随机森林算法对影响泥沙产生率和颗粒大小的断面参数和微地形参数的相对重要性进行了排序。结果表明，拦河坝建成后的粗糙度是影响泥沙产生和侵蚀颗粒选择的一个相对重要的地形因素。这些发现为黄土高原地区未来的拦挡坝建设和发展提供了有价值的信息。

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来源期刊

Hydrological Processes 环境科学-水资源

CiteScore

6.00

自引率

12.50%

发文量

313

审稿时长

2-4 weeks

期刊介绍： Hydrological Processes is an international journal that publishes original scientific papers advancing understanding of the mechanisms underlying the movement and storage of water in the environment, and the interaction of water with geological, biogeochemical, atmospheric and ecological systems. Not all papers related to water resources are appropriate for submission to this journal; rather we seek papers that clearly articulate the role(s) of hydrological processes.

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