学科：水文地质学 词目：地下水硬度 英文：hardness of groundwater 释文：水中Ca2+、Mg2+离子的含量(标准术语中已不再采用,见附录)。水的硬度对生活及工业用水影响极大。过硬的水煮食不易熟,洗涤时肥皂起沫少。饮用过软的水,对健康有害。硬水用于蒸汽锅炉,易生沉淀结成锅垢,不仅浪费燃料,又易引起爆炸。
灌区范围内地下水硬度自2002年以来，呈现上升趋势，且上升趋势比较明显；
The hardness of the groundwater has showed a rising trend since 2002 and the upward trend is obvious;
结果表明：在连续入渗条件下，阳离子交换作用是控制地下水硬度升高的主要过程；
With the help of laboratory and thermodynamic simulation, the relation of nitrogen transformation with calcium and magnesium variation during wastewater infiltration in soil water system is studied.
本文将市区的浅层地下水硬度作为灰色量，用已有的硬度数据建立GM(1,1)灰色模型，预测其未来的变化趋势。
In this paper, the hardness of the shallow groundwater was treated as a grey variable and the GM (1, 1) grey model was created to predict the future trend of the change in hardness.
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