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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Runoff erosion process on different underlying surfaces from disturbed soils in the Three Gorges Reservoir Area, China
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Runoff erosion process on different underlying surfaces from disturbed soils in the Three Gorges Reservoir Area, China

机译：三峡库区扰动土壤不同下垫面径流侵蚀过程

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摘要

Disturbed soil accumulation caused by all man-made activities during the producing and constructing process of large-scale projects is the main landform occurred artificial water and soil loss. Because of its different producing sources and soil-rock ratios, the underlying surfaces from disturbed soil accumulation often characterize a unique soil erosion process under same runoff scouring condition. Taking the ubiquitous purple soil deposits and yellow sand deposits associated with different soil-rock ratio as examples, the study aimed to explore the difference in both hydraulic properties and sediment yield characteristics on disturbed soils. Some field scouring experiments were conducted in Chongqing, China. These results indicate that: (i) Runoff regime on all underlying surfaces from disturbed soils often manifest as turbulent and subcritical flow during runoff scouring process. (ii) For rocky disturbed soils from purple soil, sediment production rate shows continuously waving variations, and the average sediment production rates are 0.28, 11.65, 33.69, 73.00, and 177.37 g/(m(2).min), respectively, when flow discharge increase from 5 to 25 L/min gradually; the collapse on gully wall caused by its gravity from underlying surfaces is the important cause for the fluctuating variations of the sediment production rate. (iii) The influencing degree of hydrodynamic parameters on sediment yield is in such order as gamma(Q) > gamma(P) > gamma(V) > gamma(T) > gamma(f). These study results could be used to control artificial erosion caused by production and construction projects and to provide some important parameters for soil and water loss predicting in the Three Gorges Reservoir Area of Chongqing
机译：在大型项目的生产和建设过程中，所有人为活动造成的土壤积聚受到干扰，是人工水土流失的主要地貌。由于其不同的生产来源和土石比，受扰动土壤堆积的下垫面通常在相同的径流冲刷条件下具有独特的土壤侵蚀过程。以普遍存在的紫色土和黄砂沉积物为例，研究了不同土石比的情况，探讨了扰动土壤水力性质和产沙量特征的差异。在中国重庆进行了一些现场冲刷实验。这些结果表明：（i）受干扰土壤的所有下垫面的径流状况通常表现为径流冲刷过程中的湍流和亚临界流。 （ii）对于紫色土质的岩石扰动土壤，沉积物产生速率显示出连续波动的变化，平均沉积物产生速率分别为0.28、11.65、33.69、73.00和177.37 g /（m（2）.min）。流量从5 L / min逐渐增加到25 L / min;重力作用从下垫面引起的沟壁塌陷是造成泥沙产生速率波动变化的重要原因。 （iii）水动力参数对沉积物产量的影响程度依次为：γ（Q）>γ（P）>γ（V）>γ（T）>γ（f）。这些研究结果可用于控制生产建设项目引起的人工侵蚀，为重庆三峡库区水土流失预测提供重要参数。

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