粤港澳大湾区地下咸水分布图

粤港澳大湾区地下咸水分布图反映矿化度大于1.0g/L的浅部地下咸水的分布规律，地下咸水是主要环境地质问题之一。粤港澳大湾区地下咸水是高海面时形成的沉积古咸水，分布较广，主要在珠三角河网中南部及滨海平原前缘,含水层岩性为粉细砂、中粗砂、砾卵石。水化学以Cl-Na型为主，包括微咸水、半咸水、咸水3种类型。The distribution map of subsurface saline water in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) reflects the distribution patterns of shallow subsurface saline water with total dissolved solids (TDS) greater than 1.0 g/L. Subsurface saline water is one of the major environmental and geological problems in the region. The subsurface saline water in the GBA is sedimentary paleo-saline water formed during periods of high sea level, with wide distribution mainly in the central-southern part of the Pearl River Delta river network and the front edge of the coastal plain. The aquifer lithology consists of silt and fine sand, medium and coarse sand, as well as gravel and cobble. Its hydrochemistry is dominated by the Cl-Na facies, including three types: brackish water, semi-saline water, and saline water.