平通河流域森林径流效应与水资源现状分析

Analysis of the effects of forest Runoff Processes and Water Resources in the Pingtong River Catchment

用森林流域水文模型(FCHM)模拟分析森林植被变化下的平通河流域森林水文过程。表明随着该流域森林覆盖率FR的提高,该流域年平均蒸散发量由无林地时候的373.3 mm降到了有林地时候的289.3 mm,因此多年平均年径流总量会随FR的增加而增加,呈流域径流正效应(23.7%)。在模拟数据的基础上,对平通河流域水资源承载力进行评价,可知该流域水资源承载力在有效承载范围之内,且还有近2亿m3的水资源量可以使用,因此有必要进行水资源高效利用规划,以促进流域经济发展。

By applying of Forest Catchment Hydrological Model（FCHM）,this paper simulated the forest hydrological effects in the Pingtong watershed.With the increase of forest cover（FR）,the evapo-transpiration decreased from 373.3 mm to 289.3 mm but the runoff would increase,resulting in a positive effect of 23.7%.The evaluation was conducted on the carrying capacity of the Pingtong River watershed on basis of the simulated data,and the results showed that the water resource carrying capacity was in the effective range,and there were nearly 200 million cubic meters of water resources available.Thus efficient use of water resources should be planned to promote the economic development of the watershed.