| 英文摘要 |
The aim of this project is to monitor the water quality of river, ocean, reservoir and groundwater in six counties located in the central part of Taiwan. The monitoring data obtained in this work can be useful to evaluate the current condition of the water systems, to predict the changing trend of quality of the water, and to provide information for government to make pollution control policy.
A total of 75 water-monitoring stations spreading in the area of six counties, the monitoring frequency is once per month. From the data obtained, it shows that the water quality of Si-Hu river is the best among the rivers monitored, while the rivers of Lu-Gang and Bei-Gang are found in relatively high extent of pollution. As to the suspended solid concerned, the concentration measured in June in the rivers of Da-An, Da-Jia and Wu are found remarkabley higher than the other months, which is possibly due to rainfall happened in summer season. In general, the water quality of 18 rivers suveyed in this year is found significantly better compared to the past two years.
The ocean water quality was subsequently monitored. According to the data collected, Hsiang-Shan (in Hsinchu city) seashore, Taichung Harbor and Chang-Hwa seashore can all meet the water quality critera of category B, while that of Yun-Lin seashore meet the criteria of category A Since there are typhoon attacks in the 3rd quarter of 2007, the water quality parameters including temperature, salinity and some metal ions measured are seen in big difference from that found before. But the situation soon return to normal as is reflected from the data shown in the 4th quarter.
There are only 3 stations for beach water monitoring in this work. The water quality of Tung-Hsiao beach resort is found better than the others. By comparing the water quality of beach resort obtained from different sampling times, it shows that the data from 2nd-sampling is obviously worse than that of the others, which can be attributed to rainfall and affluxion of rivers.
The monitoring of reservoir water in 8 dams was conducted with a frequency of once per month. The results show that the water quality of Sun-Moon Lake reservoir is the best among all the dams monitored, which meets the water quality criteria of category A. The water quality of some other reservoirs such as Li-Yu-Tan, Ter-Chi and Yung-Ho-Shan is found somewhat fluctuated.
Finally, the monitoring of groundwater was conducted in six counties covering 93 wells. The data show that among the monitoring items, ammonia nitrogen, iron and manganese are found out of quality control criteria, which is also observed in the past years. It is worth to note that the measured values of ammonia nitrgen in grounwater of Chang-Hwa county and Yun-Lin county are significantly higher than that found in the other counties, which may be attributable to the local geological characteristics. By graphically analyzing the respective monitoring item with Stiff-plotting and Piper-plotting, it shows a general trend same as that observed in the last two years, indicating no significant change of grounwater quality of these areas.
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