Numeircal Simulation Of Groundwater In The Alluvial-proluvial Fan Of Nalingguole River

Nalingguole River is located in the southwest of Qaidam Basin, belonging to thejurisdiction of Golmud City in Haixizhou of Qinghai province. The development andutilization of groundwater began in2000, and it was nature as a whole in NalingguoleRiver. As the construction and development of countries salt chemical industry,non-ferrous metals, oil and natural gas industries, groundwater resources isparticularly important. So this article rushed to Nalingguole River groundwaterresource evaluation, aiming at providing a reasonable development and utilization ofgroundwater resources in the region and a scientific basis for ecological environmentprotection.This paper analyzed3D geological structure model of the1:50000key regions(Taerding region), according to the geological and hydrogeological conditions ofresearch areas. The groundwater recharge was calculated by surface water infiltrationmethod and water table fluctuation (WTF). What’s more, the article establishedgroundwater hydrogeological conceptual model and groundwater mathematical model,and developed numerical simulation research of regional groundwater flow. The mainachievements are as follows:1By building3D geological structure model of the key regions with GMS, wedefined the structure of aquifer formation, and divided the aquifers into Quaternaryaquifer, Lower Pleistocene series and the middle and lower Pleistocene series.According to the monitoring data, the river leakage was the main supply sources inthe area, and the discharge mainly included artificial mining, evaporation, springs,and the discharge to the river.2Respectively, statistical analysis technique accounted for42.4%~47.9%of themountains caliber flow. The groundwater recharge in2011,2012was calculated bygroundwater table fluctuation method (WTF), which showed that groundwaterrecharge accounted for45.5%to49.7%of the river runoff under the current conditions. Taken together, the date calculated by WTF is more reliable and morecomprehensive consideration, and the result supplies for the region recharge.3Through the model identification and validation, the fitting error and thedistribution of water level conform to the requirements of the numerical simulation oflarge area. We can use the model for dynamic simulation and prediction ofgroundwater.4Using the identified and validated model to forecast the ground water level inthe next decade, the results show that under the supplying and mining conditions inthe current situation, the regional groundwater level is basically stable and a slightincrease, and the overflow area moves forward. Under the average annual runoffconditions (1960) and the current mining conditions of Nalingguole River, there is acertain level of groundwater decrease and the overflow area moves backward slightly.When the water diversion project started, the river leakage reduced, and thegroundwater level generally declined. When Hongxing water source was mined withthe water planning of this region, it did not produce significant adverse effects. Withthe standard that the overflow area moves backward to the half, we could presumethat the maximum safe yield of this region is1,000,000m3/d.