干旱区高山-盆地系统深部水资源的赋存和估算——以河西走廊西段为例

现行西北地区水资源评价,是基于下列水文地质概念模型：（1）作为主要补给源地的山区,其与盆地之间存在“阻水屏障”;（2）山区形成的地下水基本上已全部汇入出山河谷,流向盆地绿洲,经实地勘探水化学同位素分析与资料研究,认为现行“模型”不符合地质实际。在引用国外高山区产流数值模拟成果的基础上,采用比拟法估算出研究区,由山区通过基岩向盆地绿洲作侧向补给的大致数量。新概念模型的建立,意味着西北高山－盆地系统的绿洲基岩不深处,赋存有相当数量以前未被计入的、可供开发的水资源。

OCCURRENCE AND ESTIMATE OF DEPTH GROUNDWATER-RESOURCES WITHIN HIGH MOUNTAIN-BASIN SYSTEMS IN ARID REGIONS: A CASE STUDY OF WESTERN HEXI CORRIDOR, GANSU PROVINCE

The present water resources assessment for northwestern China is based on such hydrogeological concept model: (1) A barrier resisting water exists between mountains as a main source of runoff and basin; (2) Almost all groundwaters generated in mountain area are converged into the river outflowing from the mountain to the oasis of the basin. The data of groundwater chemistry and isotope and geologic survey show that this model does not conform with the actual hydrogeologic situation. Based on the result of numerical simulation for generating runoff in high mountain area obtained in foreign countries, an analogue method is suggested to estimate roughly the quantity recharged laterally from mountain to oasis of basin through the basement. The construction of this new concept model may reveal the fact that a considerable quantity of water resources are buried in shallow basement rocks in the oasis of mountain basin systems in northwestern China, which have never been counted in the reserves before.