潮汐河口区水化学研究中若干问题的初步探讨
PRELIMINARY DISCUSSIONS ON SOME PROBLEMS OF HYDROCHEMICAL CHARACTERISTICS IN THE TIDAL ESTUARIES
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摘要: 河口滨海区的水体是由组成和性质显著不同的河水和海水混合而成的。在河口区河水和海水的混合作用是复杂的动力学过程。在这一过程中还伴随着其他化学过程、物理化学过程和地质过程。诸如由于水质条件的剧变所引起的难溶物的沉淀作用,胶体和悬浮物的聚沉作用,各种固相与溶解成份之间的交换吸附与沉积作用以及气体交换作用等。因此,河口区混合水体所含物质的组成不仅与河水和海水的化学组成以及江河流量、涌入河口的海水量、河口的地形地貌、沿岸的地质、潮汐过程和气象等外界环境条件有关,也与伴随着混合过程而产生的许多复杂的化学、物理化学过程密切相关。这些过程尤其对混合水体中的微量元素的迁移及溶解气体的分布变化有显著的影响。Abstract: According to the data observed on Cl,SO4-,AlK,Mg++,Na++K+ (calculaced value) as well as pH in the Jinjiapg River Estuary for two years or so,the characteristics of the distribution and variation of the relative composition of major hydrochemical constituents in the tidal estuaries are discussed and summarized in present paper.The ratios of all the major constituents to chlorinity in the Jinjiang River Estuary is increasing with the mixing coefficient (γ).The rate of increase in the ratio of each major constituent to chlorinity (ΔI/Cl) in the dry season is greater than that in the flood period.
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