汉江流域地表水资源可利用量分析

采用扣损法和改进的WAM模型分别分析计算了汉江流域地表水资源可利用量.两种方法均考虑了河道内生态和生产需水量,其中扣损法是一个倒扣过程,而WAM模型则是一个顺序过程;扣损法考虑了汛期难于控制利用的洪水量,而WAM模型采用80%保证率的天然径流来折合其影响;WAM模型把水库蓄水作为一种水权来考虑,而扣损法则将水库蓄水作为地表水资源可利用量的一部分.实例研究表明,两种方法的计算结果基本一致,扣损法为207亿m3,WAM模型为223亿m3,相对误差为7.17%.

Analysis of available quantity of surface water resources in the Hanjiang River Basin

The available quantity of surface water resources in the Hanjiang River Basin is computed respectively by deduction method and improved WAM.The ecological water quantity in the river channel and production water quantity are considered in two methods.In which,the deduction method is an inversely deduction process,while the WAM model is a sequencing computation.In deduction method,the flood volume which is difficult to be used in flood season is considered,while in WAM model,the natural runoff of 80% assurance rate is considered in deduction.WAM model takes reservoir impounding water as a water right and the deduction method takes reservoir impounding water as a part of available surface water resources quantity.The practical research demonstrates that the computation results of two methods are basically identical,the available surface water resources quantity in the Hanjiang River Basin computed by deduction method is 20.7billion m3,and 22.3 billion m3 by WAM model,the relative error of two methods is 7.17%.