【摘要】 水土流失与泥沙淤积是一个普遍性的问题。水库泥沙严重淤积的原因是上游无永久有效的水保措施而自身又无完善的冲沙与输沙的设施。压力缝隙螺旋流具有流速高、水层薄、切力大、流程长，以及有利的压力分布等特点，可被应用于冲刷淤积泥沙，在２ｍ水头下，其浓度可达４００～９００ｋｇ／ｍ３。水平管螺旋流可应用来“抬托”泥沙，使推移质较容易地转变为悬移质，从而可大幅度降低流速，减小能坡，为高浓度、低能耗、远距离输送泥沙提供一种新的可靠途径。更多还原

【Abstract】 Soil erosion and sedimentation are two universal problems. The reasons of serious sedimentation in reservoirs are that there are no permanent, effective measurements in the upstream basins for the water and soil conservancy, and the reservoirs have no perfect installations to scour and convey sediment. The pressured crevice spiral flow has many characters such as high velocity, small thickness, large shear stress, long flow course, and advantageous pressure distribution etc.It may be utilized to scour sediment. Under the action of head, 2m, the concentration of the muddy water can reach to several hundred kg/m 3. The spiral flow in the horizontal pipe may be used to support sediment, and make it become the suspended load from the bed load, so as to reduce the flow velocity and the energy slope of the pipe flow. It would offer a reliable way for sediment transport with high concentration, low energy consumption, and long distance.更多还原