| 石羊河流域地下水化学环境演化特征研究 |
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| 引用本文： | 史基安.石羊河流域地下水化学环境演化特征研究[J].沉积学报,1998,16(2):145-149. |
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| 作者姓名： | 史基安 |
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| 作者单位： | 中国科学院兰州地质研究所 兰州 730000 |
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| 基金项目： | 国家科委特别资助,中国科学院重点基金 |
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| 摘 要： | 作者在系统研究石羊河流域地下水化学类型和演化特征的基础上，应用地球化学计算机模拟方法，模拟了研究区地下水中各元素存在的形式，方解石、白云石等矿物的饱和指数，进而判断了水岩作用的方向和程度，揭示了石羊河流域地下水化学环境演化机制。
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| 关 键 词： | 地下水化学环境 地球化学模拟 水岩作用 |
| 收稿时间： | 1998-04-01 |
Study on the Evolution Characteristics of Groundwater Chemistry Environment in the Shiyang River Basin |
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| Institution: | LanZhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | Based on the systematic study on the groundwater chemistry typer and their evolutional characteristics in the Shiyang river basin, the author hasthe evolution mechanism of chemical environment of the groundwater in the Shiyang river basin by the saturation index (SI) obtained through chemical simulation program. Some cognitions are reached as follows: 1. Groundwater chemistry types of the Shiyang river basin show the complete zonation, i. e, bicarbonate zone is mainly distributed in the mountainous fissure water in the upper reach and mountain front gravel area; sulfate zone is in the mountain front alluvial and fluvial plain in the middle reach; and chloride zone is in the desert and salt depression area in the lower reach. 2. In April (dry period), the calcite and dolomite are oversaturated both in the upperreach (Wuwei basin) and the lower reach(Minqing basin), but in August (rain period) the SI of the calcite and dolomite decreased obviously in Wuwei basin. In the meantime that in Minqin basin had an obviously increasing trend and both calcite and dolomite reached over saturation, implying that groundwater chemistry environment in the lower reach of the Shiyang river basin is mainly controlled by evaporation. 3. Groundwater overdraft in recent ten years has resulted in the chemistry types of the groundwater changed from bicarbonate to sulfate and even chloride in the lower reach, especially in the margin area of the desert, showing the increasing trend of mineralization and worse groundwater quality. |
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