| 曹文庚,杨会峰,高媛媛,南天,王哲,徐素娟.南水北调中线受水区保定平原地下水质量演变预测研究[J].水利学报,2020,51(8):924-935 |
| 南水北调中线受水区保定平原地下水质量演变预测研究 |
| Prediction of groundwater quality evolution in the Baoding Plain of the SNWDP benefited regions |
| 投稿时间：2020-01-16 |
| DOI：10.13243/j.cnki.slxb.20200035 |
| 中文关键词: 水文地球化学模拟 水岩相互作用 南水北调受水区 水质预测 |
| 英文关键词: hydrogeochemical modeling water-rock interaction the South-to-North Water Diversion Project benefited regions water quality prediction |
| 基金项目:国家自然科学基金面上项目（41972262）；国家地质调查项目（DD20190336，DD20160230）；中国地质科学院基本科研业务费项目（YYWF201630） |
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| 中文摘要: |
| 由于多年大规模过度开采地下水，南水北调受水区保定平原地下水严重超采，部分含水层疏干，进而引发地下水降落漏斗、地面沉降及地裂缝等环境地质问题。随着南水北调工程通水，地下水压采工作持续推进，河湖生态补水工作的全面展开，华北平原局部地区地下水位已呈现回升趋势。本文针对华北平原典型区域——南水北调受水区保定平原开展地下水位回升条件下的水质演化预测研究，采用电位分布-多点位络合模型（CD-MUSIC）预测2030年浅层地下水位上升后，水岩相互作用过程中的表面络合作用、铁锰氧化物及氢氧化物的吸附作用、离子的竞争与协同吸附效应，以及不同矿物的溶解平衡反应。结果表明：至2030年保定平原浅层地下水位整体上升后，水质逐渐向盐化方向发展，HCO3-SO4型水代替HCO3型水成为保定平原主要的阴离子水化学类型，平原东部高阳-蠡县地区出现了Cl型水，Na-Ca型水成为保定平原中东部地区主要的阳离子水化学类型；地层中岩盐及石膏的矿物溶解造成平原西部的山前冲洪积扇地区TDS含量显著上升，平原东部浅层地下水漏斗区域受到强烈的阳离子交替吸附作用影响，Ca、Mg含量显著下降，TDS及硬度下降明显，水位恢复对地下水漏斗区域水质改善具有一定的积极作用。 |
| 英文摘要: |
| Due to the over-exploitation of groundwater on a large scale for many years, the groundwater in Baoding plain,the receiving area of the south-to-north water diversion project,has been seriously over-exploited, and some aquifers have been drained, thus causing environmental geological problems such as groundwater depression cone, land subsidence and ground fissure. With the continuous development of groundwater exploitation control and ecological water supplement, the groundwater level in some parts of the North China plain has shown a rising trend. This paper is the first to carry out a prediction study on water quality evolution under the condition of groundwater level recovery in Baoding plain,the charge distribution multisite complexation model (CD-MUSIC) was used to simulate the surface complexation in the water-rock interaction process, the adsorption of iron and manganese oxides and hydroxides, the ion competition and co-adsorption effect, and the dissolution equilibrium reaction of different minerals after the rise of shallow groundwater level in 2030,the result indicate that after the overall rise of shallow groundwater level in Baoding plain in 2030, water quality will gradually develop towards salinization. HCO3-SO4 water will replace HCO3 water as the main anion water chemical type in Baoding plain, Cl type water will appear in Gaoyang-Lixian area in the east of the plain, and Na-Ca type water becomes the main cationic water chemical type in the middle and east of Baoding plain; The dissolution of halite and gypsum may lead to a significant increase in TDS content in the piedmont alluvial-diluvial fan area. The groundwater depression cone in the eastern plain is affected by strong cationic alternating adsorption, while the content of Ca and Mg decreases significantly, leading to the content of TDS and hardness decrease significantly. The recovery of water level has a positive effect on the improvement of water quality in cone regions. |
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