Based on the monitoring data of groundwater quality in Dezhou City, the paper discusses water quality characteristic and analyzes the water quality evolution of deep groundwater.
根据德州市地下水水质监测数据，本文论述了深层地下水的水质特征，分析研究了深层地下水的水质演化。
Based on a great amount of historical data to analyze the evolution of Guangzhou reach of Pearl River and the changes of water environmental quality qualitatively and quantitatively.
通过大量的历史数据，对珠江广州河段的演变和水环境质量的变化作了定性、定量分析。
The evolution of water quality is monthly and yearly, and the response to the acidification of environment is strong.
水质演化具有明显的逐月和年际变化规律；水质演化对环境酸化具有很好的响应。
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