校園人工湖之水質研究

Water quality analysis in a campus artificial lake

王聖允(Wang, shengyun)

指導教授 ： 范誠偉

國立中正大學/理學院/地球與環境科學系應用地球物理與環境科學研究所/碩士(2012年)

摘要

利用多功能水質探測儀來監測中正大學寧靜湖水質參數之變化趨勢，水質參數包含：水溫、酸鹼值(pH)、溶氧(DO)和總溶解固體(TDS)，監測期間從2009年10月到2011年8月，分為週採樣與連續式測量兩種方式。寧靜湖的主要入水來源有上游的入水口以及來自中正大學污水處理廠的放流水。在每週長期測量中，湖水水溫變化相同於氣溫，屬於季節性變化。湖水TDS濃度會因放流水的補注而上升，而降雨造成其濃度下降。湖水pH也會因降雨而下降。在連續式測量資料顯示，水溫、pH、DO和TDS皆有日變化。一天中，水溫、pH和DO最大值出現在下午4、5點，最小值在上午7、8點。降雨或寒流會造成pH和DO日變化消失。利用DO日變化可估算湖水之光合作用率和呼吸作用率，二者在4~6月出現高值，在冬季(12~2月)出現低值，每天光合作用量和呼吸作用量相當。利用TDS週採樣測值模擬寧靜湖水水動力參數，模擬之入水口高流量集中在6至9月，與地區降雨有關，高流量稀釋了放流水的影響及降低生物作用，低流量時，放流水的注入影響較大。結果顯示，影響湖水水質的因素主要包括上游入水口、放流水、氣候因素(氣溫和降雨事件)以及湖水內部之生物作用等影響。

關鍵字

水質

並列摘要

The HI 9828 Multiparameter was used to monitor the trends in water quality parameters in Tranquility Lake, National Chung Cheng University (CCU), from October 2009 to August 2011. These measured parameters, conducted by weekly sampling and continuously monitoring, include water temperature, pH, dissolved oxygen (DO), total dissolved solid (TDS). The major sources of Tranquility Lake water are the inflow from upstream and the effluent from the CCU sewage treatment plant. The long-term weekly measurements reveal that the seasonal variation of water temperature is similar to that of atmospheric temperature. The variation of TDS was found to be related to both the effluent and rainfall-derived inflows. Rainfall-derived inflow might also impact pH values in the Tranquility Lake water. In continuous sampling measurement, there are diurnal variations at temperature, pH, DO, and TDS in the sunny days. Rainfall in summer and cold current in winter may cause the disappearance of pH and DO diurnal variations. Diurnal DO profiles (high DO in hours of 4~5 PM and low DO in 7~8 AM) were used to predict lake photosynthesis and respiration rates. The daily photosynthesis rates are usually similar to respiration rates in Tranquility Lake. Weekly TDS measurements, as the water transfer tracer, were used to estimate the hydrodynamic parameters, such as the inflow from upstream and the effluent flow. High inflows from upstream were found in June to September because of the regional thunderstorms. The water quality of Tranquility Lake is found to be inflow-dependence, substantial effluent effect while low inflow; physical dilution while high inflow. We conclude that the factors affecting the water quality of Tranquility Lake, such as DO and TDS, include the water quality and water mass flow of inflow from upstream and effluent from the sewage treatment plant, climate factor (atmospheric temperature and rainfall), and biological effect in the lake water.

並列關鍵字

Water quality

參考文獻

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