甘肃省民勤干旱区红沙岗矿区水资源模拟与评价

SIMULATION AND EVALUATION OF HONGSHAGANG MINING AREA WATER RESOURCES IN MINQIN ARID AREAS OF GANSU PROVINCE

结合甘肃省民勤红沙岗矿区疏干水利用实例,基于Visal Modflow4.1软件对矿区第四系疏干水可利用量进行了数值模拟计算,并对矿区第四系松散岩类孔隙水的补给及储量进行了研究。研究结果表明:矿区第四系松散岩类孔隙水天然补给源为沟谷雨洪水入渗量和基岩裂隙水的侧向流入量之和98.41×10~4m^3/a(2 696.16 m^3/d),其储存量为2 798.45×10~4 m^3;设计矿区疏干水开采时间为30年、40年及50年时,与其对应第四系可利用疏干水量分别为281.98×10~4m^3/a(7 725.48 m^3/d)、225.32×10~4m^3/a(6 173.15 m^3/d)和183.55×10~4m^3/a(5 028.77 m^3/d),矿区疏干水不能满足计划用水量600.00×10~4 m^3/a,需寻找新的供水水源;计算结果较真实地反映了矿区疏干水储量,具有较好的实用性;所建模型为其它类似矿区疏干水可利用量的计算提供了借鉴。

Combined with the instance drainage water use on Hongshagang mining area, Minqin, Gansu province, this paper calculated the availability of Quaternary drainage water by numerical simulation, based on the software Visual MODFLOW 4. 1, and carried on the feasibility study of the supply types and its reserves of Quaternary loose rock pore phreatic water in mining area. The result shows that the supplies are the rain flood infiltration in the valley and lateral inflow from the bedrock fissure water, and the sum of them is 98. 41 × 10~4 m^3/a（2 696. 16 m^3/d）, and its reserves is 2 798. 45 × 10~4 m^3.With the design time for 30 years, 40 years and 50 years, its corresponding available quantity of Quaternary drainage water are 281. 98 × 10~4 m^3/a（7 725. 48 m^3/d）,225. 32 × 10~4 m^3/a（6 173. 15 m^3/d） and 183. 55 × 10~4 m^3/a（5 028. 77 m^3/d）, which shows the drainage water cannot meet the planning water consumption, which is 600. 00 × 10~4 m^3/a and means that the new water supply is needed. The calculation result reflects the drainage water reserves in mining area actually and practically.And the built model could provide a reference to the calculation of the available quantity of drainage water in other mining area.