基于MODFLOW的挠力河流域地下水承载力综合评价

MODFLOW-based comprehensive evaluation of groundwater carrying capacity in the Flexi river basin

地下水资源承载力强弱程度是区域内地下水资源系统与社会、环境综合作用的结果,直观地表现在地下水开采潜力上,区域地下水承载力强则表现为地下水开采潜力大,反之则表现为开采潜力小。以黑龙江挠力河流域为研究区域,综合已有地下水位动态监测数据资料,选取流域16个农灌区,采用目前应用较为广泛的地下水数值模拟软件MODFLOW,进行流域灌区地下水水量均衡与开采潜力计算,揭示地下水资源综合利用情况,基于数值模拟结果评价挠力河流域灌区地下水承载力综合评价结果的合理性。结果表明:挠力河流域灌区现状年总可开采量为1.44×10^(9)m^(3)/a,总的开采量为1.63×10^(9)m^(3)/a,地下水开采率为113.1%,灌区总体呈超采状态,但各灌区地下水资源各承载力不同。综合分析评价结果分析可知本次地下水资源承载力评价所采用的指标体系尚存在一定的不合理性,指标选取需要仔细甄别,指标分级标准需要细化。评价结果为构建合理的地下水资源承载力评价指标体系提供一定的科学指导。

The degree of carrying capacity of groundwater resources is the result of the integrated role of the groundwater resource system in the region and society and the environment,which is intuitively manifested in the potential for groundwater exploitation;a strong carrying capacity of groundwater in the region is manifested as a large potential for groundwater exploitation,and vice versa is manifested as a small potential for exploitation.Taking Heilongjiang Fuli River Basin as the study area,integrating the existing groundwater level dynamic monitoring data,selecting 16 agricultural irrigation districts in the basin,and adopting MODFLOW,a widely used groundwater numerical simulation software,to carry out the calculation of groundwater balance and exploitation potential of irrigation districts in the basin,to reveal the comprehensive utilisation of groundwater resources,and evaluating the reasonableness of the results of the comprehensive evaluation of the groundwater carrying capacity of irrigation districts in the Fuli river basin on the basis of the results of the numerical simulation.The results show:The current annual total extractable volume of the irrigation area in the Flexi river basin is 1.44×10^(9)m^(3)/a,and the total extractable volume is 1.63×10^(9)m^(3)/a,with a groundwater extraction rate of 113.1 per cent,and the irrigation area in general is in an over-exploited state,but the carrying capacity of each of the groundwater resources of the various irrigation areas is different.Comprehensive analysis of the evaluation results shows that the indicator system used in the evaluation of the carrying capacity of groundwater resources still has some irrationality,the selection of indicators needs to be carefully screened,and the grading standard of indicators needs to be refined.The evaluation results provide certain scientific guidance for the construction of a reasonable evaluation index system of groundwater resources carrying capacity.