The Groundwater System And Resources In Piedmont Plain Of Golmud River Basin In Qinghai Province

Surface water and groundwater in the piedmont area of Golmud River, which are in closecontact, interdependence and mutual transformation, constitutes a typical inland basin river-aquifer system in Northwest. In front of Golmud alluvial fan compose of thick deposition layerof Quaternary loose sandy gravels, a large burial phreatic aquifer with abundant groundwaterrecharge, large storage capacity, shallow buried, water-rich and good water quality, is suitablefor large-scale centralized exploitation.In Golmud River basin, average annual surface water resources is9.42×10~8m~3, roundwaterresource is6.35×10~8m~3, repeated resources amount of5.91×10~8m~3, and the total quantity ofwater resources in the region is9.86×10~8m~3. Application of mathematical models in randomsequence hydrological forecasting results showed that: the recent (2020) total recharge ofgroundwater resources is6.38×10~8m~3/a (174.72×104m3/d), the amount of exploitablegroundwater resources is1.46×10~8m~3/a (40×104m3/d), the utilization rate is only22.9%, thereis still a great potential for exploitation; total surface water resources forward (2030) was9.36×10~8m~3/a, the total amount of groundwater resources is6.65×10~8m~3/a (181.54×104m3/d),deduct the repeated resources, the total quantity of water in the basin is9.82×10~8m~3/a, not lessthan75×104m3/d can be exploited after evaluation.Based on the simulation of random sequence hydrological forecasting, under the conditionof planning to exploit groundwater resources in75×104m3/d, the overflow water of springs setwill reduce19.032×104m3/d, the area of swamp wetland will reduce, the evaporation ofGolmud River Basin will20.371×104m3/d. But it will not cause hydrogeological environmentalproblems, such as ground subsidence, collapse, and the ecological impacts on vegetation indownstream are in a controllable range.