台兰河流域地下咸水影响因素及演化预测OA
Influencing factors and evolution prediction of groundwater salinity in the Tailan River Basin
为探明台兰河流域地下咸水的影响因素与演化规律,本文以台兰河流域为研究区,基于94组地下水水化学数据,综合运用水化学统计、Piper三线图、离子比值分析与空间插值等方法,系统分析地下咸水的空间分布及影响因素;在此基础上,构建了MODFLOW-SEAWAT耦合变密度流-溶质运移模型,设置无开采和现状开采两种情景,对2020-2030年期间地下水TDS的水盐运移过程进行了模拟预测.结果表明:(1)TDS空间分布沿河流下游两侧方向由低向高过渡;地下水总体呈中性-弱碱性,以Na++K+、Cl-和SO42-为主,水化学类型以SO4-Ca·Mg型与Cl-Na型为主.(2)地下水化学组成受岩石风化、蒸发浓缩及阳离子交换共同控制,其中蒸发浓缩是形成高TDS水体的主导因素.(3)在无开采条件下地下水咸化呈持续发展趋势,淡水区的面积不断萎缩,由75.72％减至74.94％,减少了13.55 km2,咸水区的面积逐渐增大,由153.64 km2增至169.64 km2,面积占比增加0.92％;在现状开采条件下,由于开采加速地下水流动更新,一定程度上抑制了地下水咸化,淡水区面积增加37.15 km2,面积扩大了2.14％,而咸水范围相对收缩,其面积占比减少2.09％,高矿化水体扩展受到一定抑制.本研究对台兰河流域咸水资源合理利用及促进区域水资源可持续发展具有重要意义.
To explore the influencing factors and evolutionary patterns of groundwater salinity in the Tailan River Basin,this study selected the basin as the research area.Based on 94 groups of groundwater hydrochemical data,the spatial distribution characteristics and influencing factors of groundwater salinity were systematically ana-lyzed using hydrochemical statistics,Piper three-line diagram,ion ratio analysis,and spatial interpolation meth-ods.On this basis,a MODFLOW-SEAWAT coupled variable-density flow and solute transport model was devel-oped.Two scenarios,no groundwater extraction and current extraction conditions,were established to simulate and predict groundwater total dissolved solid(TDS)transport processes from 2020 to 2030.The results show that(1)TDS in the study area shows a spatial trend of increasing from upstream to downstream along the river.The groundwater is generally neutral to weakly alkaline,with the dominant ions including Na++K+,Cl-,and SO42-.Hy-drochemical types are mainly SO4-Ca·Mg and Cl-Na.(2)Groundwater chemistry is primarily controlled by rock weathering,evaporation-concentration processes,and cation exchange,with evaporation-concentration identified as the dominant factor contributing to the formation of high-TDS water bodies.(3)Simulation results show that under the no-exploitation scenario,the salinization of groundwater continues to develop:the proportion of fresh-water areas shrinks from 75.72％to 74.94％(a reduction of 13.55 km2),while the saline water area gradually in-creases from 153.64 to 169.64 km2(an increase of 0.92％in its area share).Under current pumping conditions,ac-celerated groundwater circulation owing to extraction partially inhibits salinization.The area of freshwater in-creases by 37.15 km2(an expansion of 2.14％),whereas the area of saline water decreases by 2.09％,indicating a mitigation of highly mineralized water expansion.These results provide important guidance for the rational utili-zation of saline water resources and the sustainable management of groundwater in the Tailan River Basin.
马晓菲;杜明亮;崔瑞;刘炎昆;胡舒婷;庹子赟;田笑语
新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052||新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052||新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052||新疆未来灌区工程技术研究中心,新疆 乌鲁木齐 830052||温宿未来灌区野外站,新疆 温宿 843100新疆水利水电科学研究院,新疆 乌鲁木齐 830049新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052||新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052||新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052||新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052||新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052
台兰河流域咸水演化水化学特征影响因素MODFLOW-SEAWAT
Tailan River Basinsaltwater evolutionhydrochemical characteristicsinfluencing factorMOD-FLOW-SEAWAT
《干旱区研究》 2026 (9)
1859-1874,16
"新疆水利工程安全与水灾害防治重点实验室"2024年研究项目(ZDSYS-YJS-2024-69)
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