【摘要】 本文讨论了湘江水系河水一些主要水化学指标的特征及其环境化学效应,计算了河水的化学稳定性指数和化学侵蚀速率,讨论了该水系重碳酸盐型河水的侵蚀及沉积平衡与总盐量的相关关系,还论证了河水的地球化学特征与水热条件和地质因素的关系。更多还原

【Abstract】 The quality of water in the Xiangjiang river system may be classified into the bicarbonate type. The equilibrium course of carbonates is the basic adjustment factor controlling the geochemical process of water quality.The river water is mainly bicarbonate──Ca type with a pH higher than 8, and with ageneral total salt of more than 150 mg/l.Besides this, there is the bicarbonate──Na type with a pH generally between 7.1 to 7.5, itstotal salt is usually less than 100 mg/l.The deposition in bicarbonate──Na type occurs when the total salt is more than 140-150 mg/l.When the total salt is 50-60 mg/1, erosion takes place in the bicarbonate-------Ca type. Theerosion intensity varies greatly in the Xiangjiang river system, from 50 t/a.km2 to up 200 t/a. km2. It is in positive correlation with total salt.更多还原