Sediment dynamics is still imperfectly understood, especially at spatial scale in the highly erodible region of the Loess Plateau, and few studies have been heretofore conducted. Using 5-year continuous water and sediment records, three plots and three basins in the gullied rolling loess region were selected and sediment dynamics at spatial scale was studied. Results showed that the floods, where the peak discharge (Q p) did not come earlier than the sediment peak, were predominant in slope zones, occupying 90 and 70% of the total for the Mao slope and for the Entire slope, respectively. However, in basins, most of the sediment peaks (C p) lagged behind Q p, implying that slope zone was the main origin of sediment. More than 50% of the events presented clockwise hysteresis loops in the Mao slope area, while almost all the events had anticlockwise hysteresis loops in basins. This can be attributed to less occurring frequency of hyperconcentrated flow, as well as its instability in slope zones, compared to those in the basins. Within these contexts, gravitational erosion made the highest sediment concentration (C) in Tuanshangou basin and median developing status of C-discharge (C–Q) relationships in the Entire slope area. This study provides insights into the protection of slope surface and disruption of the development of hyperconcentrated flow to reduce soil loss.
展开▼
机译：泥沙动力学仍然不完善，特别是在黄土高原高度易蚀区域的空间尺度上，迄今进行的研究很少。利用5年连续的水沙记录，在黄土丘陵沟壑区选择了3个样地和3个盆地，研究了空间尺度上的沉积动力学。结果表明，洪峰的流量最大（Q p ）不早于泥沙峰，在坡区占主导地位，占毛坡总量的> 90％和> 70％和分别用于整个坡度。然而，在盆地中，大多数沉积物峰（C p ）滞后于Q p ，这表明斜坡带是沉积物的主要来源。毛斜坡地区超过50％的事件呈顺时针方向的磁滞回线，而盆地中几乎所有事件都具有逆时针的磁滞回线。与盆地相比，这可以归因于高浓度流的发生频率较低，以及其在斜坡带的不稳定性。在这种情况下，重力侵蚀使团山沟盆地的沉积物浓度（C）最高，整个斜坡区的碳排放量（C-Q）关系的中值发展状况。这项研究提供了对保护坡面和破坏高浓度水流发展以减少土壤流失的见解。
展开▼
