下垫面变化对宁夏水资源量影响研究

Study on Influence of Underlying Surface Variation to the Volume of Water Resources of Ningxia

对下垫面产汇流条件变化造成的区域水资源量的变化,在区域水资源评价与中长期规划中应予以充分考虑。以TM遥感影像为基础资料,运用GIS软件,对宁夏1985年和2000年各类土地面积的变化情况及对水资源量的影响进行了研究,结果表明:2000年与1985年相比,水地、旱地、高覆盖草地、城镇用地面积明显增加,中、低覆盖草地和水库、沼泽、滩地面积减少;全区水资源量减少了0.9亿m3。

It should fully consider the variation of the volume of regional water resources caused by the variation of runoff producing and confluence condition of underlying surface during the regional water resources evaluation and medium and long-term planning.The paper studies the variation of various kinds of land area in 1985 and 2000 in Ningxia and the influence to the volume of water resources.The outcomes show that in 2000,the area of irrigated lands,non-irrigated lands,highly covered grasslands and city occupied lands is remarkably increased;the area of medium and low covered grasslands,reservoirs,marshlands and floodplain reduced and;the volume of water resources of the whole region reduced 90 million m3 comparing with that of in 1985.