石羊河流域的水资源

石羊河流域分为径流形成区(山区)和散失区(平原区),由河流联接成为统一的水资源系统和完整的生态单元。全流域出山地表水资源15.82亿立方米,平原区纯地下水天然资源1.54亿立方米,合计7.36亿立方米。地表径流主要形成于高山区,面积占30%的高山区(3400米以上),产流量占74%。山区河流有连续丰、枯水年,丰水年持续期为10年,枯水年持续期达20年。本流域山前平原地区的地表水、地下水相互制约,相互转化,水资源主要来自山区,地下水是地表水的渗漏,泉水是出露的地下水。水资源转化为重复利用和提高利用率创造了条件,但不能增加数量。

Water Resources in the Shiyang River Basin

The Shiyang River Basin can be divided into streamflow formation area (mountain area) and loss area (plaim area),while rivers connect them to be an unified water resources system and a whole ecological unit. Surface water resources flowed from the mountain area in the Basin amount to 1582 millions of cubie meters, the natural underground water resources in the plain, area amount to 154 milloins of cubic meters, and the two of them amounts to 1736 millions of cubic meters. The surface runoff is mainly formed from alpine zone. The alpine zane (over 3400 meters above sea level), which occupies only 30 percent of the mountain area. Produced 74 Percent of total runoff. The streams in the mountain area are characterized by the continuous high flow year Periods and the continuous low flow year Periods. The former is about ten years, and the latter twenty years.The surface Water and the underground water in the front of the moun tain area in the Basin limits each other and transform from one to another. The water resources in the Basin are mainly Produced in the mountain area. The underground Water comes from the seepage of the surface Water and spring water belongs to the underground water from the aquifers. The transformation of Water resources Provides more conditions for reusing the water and for increasing its ratio of utilization, but it is impossible to increase the total volume of the water and its sources.