论文部分内容阅读
乌鲁木齐河西山地区位于流域中游上段山间盆地的西部,具有独特的水文地质条件,作为乌鲁木齐市的备用水源地,其地下水环境和补给排泄条件的研究非常重要。通过地表水和地下水的化学成分演化研究,结合氢氧稳定同位素分析,将地下水的补给分为两期,即全新世补给和晚更新世补给,并以此得出乌鲁木齐河在晚更新世发育于研究区现在河道的西侧,自末次冰期后由西向东摆动的结论。另外西山地区农场的灌溉活动,促进了河水的蒸发以及后续的溶解交替发生,方解石和石膏矿物不断从河水中溶解,芒硝的相对浓度不断在地下水中累积。当原河水蒸发成固相蒸发盐,然后溶解在新补给的水体中时,原河水的氢氧同位素值不再被保留下来。
The western part of Urumqi River lies in the western part of the upper reaches of the basin in the middle reaches of the basin. It has unique hydrogeological conditions. As the reserve water source in Urumqi, the research on groundwater environment and supply and discharge conditions is very important. Based on the evolution of chemical composition of surface water and groundwater, combined with the analysis of stable oxygen and oxygen isotopes, groundwater recharge is divided into two phases, that is, the recharge of the Holocene and the recharge of the late Pleistocene. Based on this, the Urumqi River developed in the late Pleistocene The study area is now on the western side of the river and is the result of a westerly swing from west to east since the last glacial period. In addition, the irrigation activities in the Xishan farm promoted the alternation of river evaporation and subsequent dissolution. Calcite and gypsum minerals were continuously dissolved from the river water, and the relative concentration of thenardite was continuously accumulated in the groundwater. When the original river water evaporates into a solid phase evaporation salt, and then dissolves in the newly supplied water, the original river water hydrogen and oxygen isotope values are no longer retained.