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以黄土丘陵沟壑区内相邻的2条支沟(桥子东沟和桥子西沟)为研究对象,基于遥感影像获得土地利用数据,利用水文站1986-2004年观测的次降雨-径流-泥沙过程资料,研究了小流域土地利用变化(主要以增加水土保持措施为主)对径流输沙的影响。结果表明:在黄土丘陵沟壑区,增加土地利用/土地覆被能够有效地减少小流域的径流量、产沙量;在次降雨量、降雨强度较小,土地利用变化不明显的情况下,两流域次降雨水沙关系差异不显著,在次降雨量、降雨强度较大和土地利用变化明显时,两流域次降雨水沙关系差异显著,坡耕地改梯田的农田水利建设可能是导致水沙变化的主要原因。
Taking the two adjacent branch ditches (Qiaotong Donggou and Qiaoxi Xigou) in the gully area of Loess Plateau as the research object, land use data were obtained based on remote sensing images. Based on the data of sub-rainfall-runoff- Sediment process data to study the impact of small-scale land use change (mainly to increase soil and water conservation measures) on runoff and sediment transport. The results show that in the loess hilly and gully regions, increasing land use and land cover can effectively reduce runoff and sediment yield in small watershed. Under the condition of secondary rainfall, small rainfall intensity and obvious land use change, There was no significant difference in the relation between rainfall and sediment in sub-rainfall of the basin, and there was significant difference in the relationship between the sub-rainfall and sediment in the two basins when rainfall, rainfall intensity and land use change were obvious. main reason.