大型灌区陆地水循环模式的参数化方案:LWCMPS_ID

Parameterization scheme of land water-cycle model for large irrigation districts: LWCMPS_ID

地表水系统、地下水系统和土壤植物大气连续体的强烈耦合作用是大型灌区水文过程的基本特点,这导致对大型灌区的陆地水循环和水资源进行评价必须采取综合的方法,然而目前还缺少适用的模拟工具。农业灌区的水文特征与天然流域存在显著差别,常规流域水文模型和陆面过程参数化方案用于大型灌区陆地水循环的分析还存在较大的困难。LWCMPS_ID是本文提出的一个适用于大型灌区陆地水循环模式的参数化方案,采用分块集中参数模型简明地实现了地表水、地下水和土壤水的动力学耦合分析,并且包含了一个土壤水冻结融化的简化模型。对处在黄河流域的内蒙古河套灌区,用LWCMPS_ID进行20 年水文动态的模拟,取得了较好的效果。

In a large irrigation district, the soil-plant-atmosphere continuum is actively coupled with surface water system and groundwater system. Because of these hydrological characteristics, an integrated method is needed to investigate the land water-cycle patterns and water resources in a large irrigation district. However, effective simulation tools are lacking. It is difficult to analyze the land water-cycle in large irrigation districts by using a general hydrological model of watersheds or a parameterization scheme of land-surface process. The reason for this is that there are distinct differences in hydrological features between agricultural regions and natural watersheds. LWCMPS_ID is a parameterization scheme of land water-cycle model presented in this paper for large irrigation districts. Dynamical models of surface water, groundwater and soil water are developed and coupled with sub-region-parameter method, including a simplified model of soil water frozen-thawing process. The land water-cycle patterns simulated with LWCMPS_ID in the Hetao irrigation district, a large district in the Yellow River watershed for 20 years, show the validity of the model.