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以陕北黄土丘陵沟壑区延河、清涧河、汾川河3条流域作为研究区域,针对该区9个水文站点的6-9月径流量、输沙量的数据,探讨了时空尺度变化对径流与输沙相关性的影响。结果表明二者在不同的时间尺度和空间尺度上其相关程度差异明显。基于径流因子与输沙因子的关系所拟合的曲线模型中,7,8月份的模型拟合优度在整体上高于6月、9月,汛期的模型拟合优度一般低于7,8月份的模型拟合优度。汛期清涧河流域的模型拟合优度高于延河和汾川河流域,区域的模型拟合优度高于延河和汾川河流域,但略低于清涧河流域。
Taking Yanhe, Qingjianhe and Fenchuanhe watersheds in the loess hilly and gully regions of northern Shaanxi as study areas, the data of runoff and sediment discharge from June to September at nine hydrological stations in the area were studied. Impact of runoff and sediment transport. The results show that there are significant differences between the two in different time scales and spatial scales. Based on the curve model fitted by the relationship between runoff factor and sediment transport, the goodness of fit of the model in July and August is higher than that of June, and the goodness of fit of model in September and September is generally lower than 7, August model goodness of fit. The model goodness of Qingjian River basin in flood season is higher than that of Yanhe River and Fenchuan River, and the model goodness of fit in Yanqing River and Fenchuan River is higher than that in Qingjian River Basin.