中文关键词
地表水水化学特征离子来源控制因素盐城地区 | 英文关键词surface waterhydrochemical characteristicsion provenancecontrolling factorsYancheng area |
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| 中文摘要 |
| 地表水资源是东部沿海地区经济发展的基础之一，在高强度的人类活动影响下，广泛面临着水质异常及污染等问题.在调查采样的基础上，以区域地质为背景，通过Gibbs图、Pipper三线图、离子当量和摩尔比关系，利用数理统计，探讨盐城地区地表水的化学组成特征及控制因素.结果表明：①研究区地表水pH值偏低及TDS偏高，前者可能受人类活动排放的酸性有机污染物及土壤中厌氧生物分解形成的酸类物质的控制，后者呈显著地西低东高，北低南高的趋势.②溶质中阳离子以Na+为主，阴离子以HCO3-和Cl-为主，水化学组成整体呈HCO3-（Ca+Na）型为主，但次类型在不同区域存在显著差异.③因研究区淤积层主要以黏土、亚黏土和砂岩为主，地表水中可溶性物质主要来源于碳酸化作用引起的钠长石为主的硅酸盐岩碎屑物分解，并辅以碳酸化作用导致的碳酸岩分解.其中滩涂湿地扩张区还因地势低洼，地下水位浅，溶质显著地受蒸发-浓缩作用的影响，并伴有蒸发盐岩风化补给.④不同区域的地表水虽然受到人类活动的影响存在一定差异，但影响作用显著.特别是在废黄河区和滩涂湿地扩张区，水质不仅显著受到农业生产的影响，还受区域以化工为主的产业废水排放的作用. |
| 英文摘要 |
| Surface water resources are crucial to economic development in China's eastern coastal areas. Under the influence of intense human activities, problems such as abnormal water quality and pollution are very prominent. Here, the chemical composition of surface waters and their controlling factors were analyzed in the Yancheng area. The results showed that:① The surface water pH is low and the concentrations of total dissolved solids(TDS) are high in the study area. pH is likely controlled by the acidic organic pollutants discharged by human activities as well as acidic substances formed by anaerobic decomposition in soils. TDS data showed low values in the west and high values in the east, and low values in north and high south of the study region. ② Cation content was dominated by Na+, anions were dominated by HCO3- and Cl-, and, overall, hydrochemical composition was controlled by HCO3-(Ca+Na), although there was significant variability between the different regions. ③ Because the silt layer in the region is mainly composed of clay, subclay, and sandstone, the soluble matter in surface water is mainly derived from the decomposition of Na-feldspar in silicate debris via carbonation, supplemented by carbonation. Due to the low-lying terrain and high groundwater level in the tidal flat area, solutes are significantly affected by evaporation-driven concentration alongside evaporite weathering replenishment. ④ Although the surface waters in different regions were found to be affected by human activities to varying degrees, the impact was always strong. In particular, in areas of tidal wetland expansion, water quality is not only affected by urban sewage and agricultural irrigation but also industrial wastewater discharge. |
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