变“水低地高”为“水高地低” 重塑黄河上游水土关系.

The situation of Gansu Province is that the ecological environment is fragile and the task of poverty,Jleviation is heavy, which is directly or indirectly related to the incoordination of water and soil relations. The inability of water to conserve the soil,md the soil docs not contain water, leading to serious soil erosion and weakening the productivity of the land. This problem stems from the spatial layout of water and soil determined by the unique topography of Gansu, that is, the basic form of "water flows lower than the ground" . This paper put forward the fact that the newly added water volume of the South-to-North water Diversion Project must pass through Gansu. Somewhere between I 800 m and I 900 m above sea level in the upper reaches of Liujiaxia Reservoir, the Dujiangyan River divides the Minjiang River into two pat1s, as docs the Yellow River. The Yellow River was divided into a natural river and an Artificial river, forming a chord-arc two-way circulation pattern, in which the at1ifici,J river, that was, the chord line flowed from the southwest to the not1hwest,Jong the contour line of about I 800 m above sea level, with a gradient of about 0.04%·,md slowly flowed to the Jingithai platform,area. The highest point was at I 773 m, and then it returned to the natural channel of the Yellow River after being irrigated by gravity in several directions, thereby changing the "water flows lower than the ground" to "water flows higher than the ground" . The implementation of this "chord arc two-way scheme" can not only promote the ecological protection and high-quality development of the ecologically fragile area of more than 10 000 km' between Liujiaxia and Heishanxia of the Yellow River,md the lower Shiyang River, but,also benefit the planned Daliushu irrigation area, making it into ml important natural food security reserve base. It is also beneficial to reduce the harm of salinization,Jong the Y d low River irrigation area and reduce the sedimentation, flood control and ice control pressures of Ningxia-Inner Mongolia section in the downstream. [ABSTRACT FROM AUTHOR]