毛不拉孔兑属于黄河的一级支流,排沙危害最为严重的孔兑之一。根据地貌特征由南向北可分为黄土丘陵沟壑区、风沙区(库布齐沙漠区)、黄河南岸冲积平原区3个带状分布的自然单元,主要特征:降水径流量年际变化大,年内不均;泥沙含量高,输沙量大;侵蚀类型为多重侵蚀叠加,复合型侵蚀严重。分析其原因是:暴雨是造成水土流失的直接动力;地形破碎是造成水土流失的根源;植被稀少,保水保土能力弱;土壤质地松散是水土流失的催化剂;大风加速该区风蚀沙化;人为破坏加速水土流失。防治对策:采取“上拦、中分和下建”的综合治理思路,运用水土流失治理与内蒙古水土资源利用相结合理念,协调水土资源关系,形成上、中、下游“三道防线”。 Mao clamper hole belongs to a tributary of the Yellow River, sediment discharge is one of the most serious hole against. According to the geomorphological features, it can be divided into three belt-shaped natural units in the loess hilly and gully regions, the wind-blown area (Khuzizi desert area) and the alluvial plain on the south bank of the Yellow River from the south to the north. The main features are as follows: Uneven during the year; high sediment content and large amount of sediment transport; type of erosion was superimposed by multiple erosion, and composite erosion was serious. The reasons for this are as follows: heavy rain is the direct cause of water and soil loss; the topography is the root cause of water and soil loss; the vegetation is sparse and the ability of water and soil conservation is weak; soil looseness is the catalyst of water and soil erosion; Accelerate soil erosion. Prevention and control measures: Adopt the integrated management idea of ​​“stopping, dividing and building” and make use of the concept of combination of water and soil loss management and the utilization of water and soil resources in Inner Mongolia, coordinate the relationship between water and soil resources and form the three lines of defense of upstream, middle and downstream ".