关键词: 地下水, 水文地球化学, 裂隙水, 孔隙水, 江汉平原

Abstract: The groundwater migration from hilly area of western Hubei Province to Jianghan Plain is a complex hydro-geochemical process. This paper studies the movement and chemical composition variation of groundwater in western margin of Jianghan Plain by mathematical statistics, water chemistry analysis, Gibbs diagram and hydro-geochemical simulation. The results show that the major chemical types of fissure karstic water are HCO3-Ca and HCO3-Ca+Mg, fissure water in cataclastic rocks are HCO3-Ca and HCO3-Ca+Na, pore water is HCO3-Ca. The dissolution of calcite and dolomite is the dominant hydro-geochemical process in hilly area. The pore water and fissure water are mainly affected by dissolution of halite and gypsum. Cation exchange adsorption occurs in fissure water, and a small amount of pore water is affected by evaporation-precipitation. The gypsum and a small amount of halite and potassium feldspar are dissolved during the migration of groundwater from hilly to plain, accompanied by cation exchange adsorption, nitrification reaction and precipitation of oversaturated calcite and a small amount of albite.

Key words: groundwater；hydro-geochemistry； fissure water； pore water, Jianghan Plain