Check dams are a critical soil and water conservation engineering measure in gullies that significantly influence erosion, transportation, and sediment accumulation. Check dams help reduce erosion in the upstream area, ignoring the off‐site erosion reduction capacity due to erosion dynamics, and it also alters the morphology of gullies. The morphology of the gully cross‐section from the head to the inlet of the gully is mainly “V” shaped, “V, U,” transitional shaped, “U” shaped and trapezoidal shaped. The construction of check dams can force the geomorphologic evolution of the sub‐watershed to accelerate the transition to “old age” and reduce the allocation of sediment initiation during field sub‐flooding, thus promoting sediment deposition processes. The percentage of downstream scour hours in watersheds where check dams were constructed was 0.65% and 0.80%, respectively, compared to 19.78% and 19.06% in watersheds where there are no check dams. The results reveal the role check dam constructions play in gully morphology evolution from a hydrodynamic perspective and fill the gaps in off‐site erosion reduction, providing theoretical support for assessing the role of check dams in soil and water conservation work.

中文翻译：

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基于无人机遥测结合数值模拟的淤地坝对河流廊道演化的动力机制

淤地坝是沟渠重要的水土保持工程措施，对侵蚀、输送、积沙等影响显着。拦河坝有助于减少上游地区的侵蚀，忽略了由于侵蚀动力学而产生的场外侵蚀减少能力，并且它还改变了沟渠的形态。沟头至沟口断面形态主要有“V”形、“V、U”形、过渡形、“U”形和梯形等。淤地坝的建设可以迫使次流域地貌演化加速向“老年期”过渡，减少田间淹没过程中泥沙萌生的分配，从而促进泥沙沉积过程。建有淤地坝的流域下游冲刷小时数比例分别为0.65%和0.80%，而未建淤地坝的流域下游冲刷小时数比例为19.78%和19.06%。研究结果从水动力角度揭示了淤地坝建设对沟谷形态演化的作用，填补了场外侵蚀减少的空白，为评价淤地坝在水土保持中的作用提供了理论支撑。