Quantitative Analysis of Response of Water Resources Allocation on Water Cycle System in Ningxia Hui Autonomous Region
水资源配置的水循环响应定量研究——以宁夏为例

Water resources rationally allocated by engineering and non-engineering measures will change the regional water cycle from two aspects: cycling process and cycling modes.Water evaporation,runoff,infiltration and groundwater table etc are also changed to directly affect the status of regional water resources,water demand,ecosystem as well as the rationality of water resources allocation.Taking Ningxia as an example,the paper systemically analyzes the water cycle changes in different areas caused by water resources allocation measures.Moreover,the quantificational methods are presented to study water cycle affected by water resources allocation.With these methods,the water cycle changes are brought out by water resources allocation in plain area and mountainous areas of Ningxia.As a result,the intensity of water cycle in plain area would be weakened greatly,and the total water consumption would be reduced in the year 2010.Then it would increase slowly since 2020.The water diversion and drainage in the plain area would decrease greatly,and the drain component,groundwater supply and consumption would change notably.The groundwater table would drop 0.18 and 0.41 meter in the irrigation and non-irrigation period respectively in Qing Tongxia irrigation area in 2010.It is expected to drop 0.37 and 0.65 respectively in 2020.The ecological water consumption would be reduced and water source of lakes would be transferred from natural supply to artificial supply.With reconstruction measures carried out in pumping irrigation area,the regression of water in unit area would be reduced to some extent.Due to the adoption of measures of water and soil conservation in mountainous area of Ningxia,soil water resources woud increase to 0.026 and 0.038 billion cubic meters.Consequently,the local precipitation would effectively been used.