| 用氢氧稳定同位素揭示闽江河口区河水、地下水和海水的相互作用 |
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| 引用本文：章斌,郭占荣,高爱国,袁晓婕,李开培.2013.用氢氧稳定同位素揭示闽江河口区河水、地下水和海水的相互作用[J].地球学报,34(2):213-222. |
| DOI：10.3975/cagsb.2013.02.08 |
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| 基金项目:福建省重点基金项目(编号: 2009I0025);国家自然科学基金项目(编号: 41072174) |
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| 中文摘要:为了揭示闽江河口两岸的地下水形成演化规律以及河口区河水、地下水和海水的相互作用, 分别于2009年枯水期(10至11月)和2010年丰水期(7至8月), 在闽江河口区采集了河水、地下水和海水样品, 测定了水样的氢氧稳定同位素组成和盐度。研究结果表明: (1)闽江河口两岸的浅层地下水主要接受降水补给, 北岸地下水还接受山区基岩裂隙水补给, 南岸浅层地下水在枯水期还接受经过蒸发作用的灌溉水补给; (2)闽江河口区, 枯、丰水期河水与地下水的补排关系始终表现为地下水补给河水, 枯水期南岸地下水在河口混合中的贡献明显增大; (3)海岸带含水层基本上不存在海水入侵, 仅局部含水层有微弱的海水入侵迹象; (4)丰水期和枯水期的淡咸水混合带在河口中的位置和混合类型存在明显差异。 |
| 中文关键词:地下水 河水 海水 氢氧稳定同位素 盐度 混合作用 闽江河口 |
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| An Analysis of the Interaction between River Water, Groundwater and Seawater in Minjiang River Estuary Region, Fujian Province, Based on Stable Isotopes D and 18O |
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| Abstract:The aim of this study is to reveal the origin and evolution of groundwater as well as the interaction between groundwater, river water and seawater. During both the dry season (October and November) and the wet season (July and August) of 2009, the authors collected fresh river water and brackish water samples in Minjiang River estuary, groundwater samples near Minjiang River estuary, and seawater samples in Taiwan Strait, then measured salinity, D and 18O isotopic composition for the water samples. Some conclusions have been reached: (1) the unconfined groundwater on both sides of Minjiang River estuary is mainly recharged by rainfall, the groundwater on the northern side is also recharged by the bedrock fissure groundwater, and the groundwater on the southern side is also recharged by the irrigation water in the dry season, which has somewhat experienced evaporation before discharging; (2) the interaction between river water and groundwater always shows that the groundwater recharges to the river water occur in both dry season and wet season, and the mixing ratio of groundwater from the southern side of Min River estuary significantly increases in the dry season; (3) the seawater intrusion in the costal aquifer doesn’t exist on the whole, and this kind of phenomenon just occurs locally in a small part of the costal aquifer; (4) the site and mixture type of the mixed zone between fresh and brackish water in the estuary in the dry season is clearly different from those in the wet season. |
| keywords:groundwater river water seawater stable isotopes D and 18O salinity mixing action Minjiang River estuary |
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