宁夏灌区节水潜力的研究

通过广义水资源配置模型和平原区水循环模型的有机耦合，分析了宁夏的真实节水潜力——耗水节约量，并建立了宁夏平原区取用水节水与耗水节水二者之间的定量化关系。结果表明，宁夏耗水节水潜力远远小于取用水节水潜力。在宁夏平原区，随着水利用系数的提高，农业取用水量和耗水量不断减少，且减少幅度越来越小。随着水的利用系数的提高，农业取用水节水量和耗水量不断提高，且取用水节水量和耗水节水量的增加幅度越来越小。随着取用水量的减少，耗水量也逐渐减少，但减少幅度越来越小。当取用水达到极值点时，取用水量等于耗水量。随着取用水节水量的提高，耗水节水量也逐渐增加，但增加幅度越来越小，最后趋近于零。

Water saving potential in irrigation area of Ningxia Autonomous Region

The water saving potential of Ningxia Autonomous Region is analyzed by coupling the water deployment model of generalized water resources with regional water cycling model. The quantitative relationship between saved amount of water withdrawal and saved amount of water consumption in plain area is established. The result shows that the water saving potential of consumption is much less than that of water withdrawal. In plain area, following the increase of water use coefficient, the amount of water withdrawal and consumption for agriculture is gradually decreased and at the same time the saved amount of water withdrawal and the saved amount of water consumption increase gradually, but the increase rate tends to small. Following the reduction of water withdrawal the water consumption decreases and the decrease rate tends to diminished. The water withdrawal will be equal to the water consumption if it reaches the maxima. Following the elevating of saved amount of water withdrawal the saved amount of water consumption increases gradually but the increase rate tends to be reduced.