IN-SITU INVESTIGATION AND SIMULATION OF WATER QUALITY CHANGES IN SONGKHLA LAKE, THAILAND
Songkhla Lake is located in the Southern part of Thailand, connected with the Gulf of Thailand through a narrow channel. It comprises of three lakes: Thale Noi, Thale Luang and Thale Sap Songkhla. In the southernmost lake, Thale Sap Songkhla, aquaculture of sea bass plays an important role in the area’s economy. In recent years, however, there have frequently been sudden deaths of fishes which may be due to the significant change in water quality in this lake. In-situ investigation has been carried to thoroughly clarify the mechanism of the changes of water quality parameters in Songkhla Lake. In this field investigation, automated water quality measuring instruments are installed in an aquaculture area to obtain time variation of current, dissolved oxygen (DO), salinity and temperature. In addition to investigate the water quality changes in the lake, an artificial neural network (ANN) model is applied to evaluate the mechanism of DO concentration in the Songkhla Lake. It is concluded that there is a good correlation between DO and both air temperature and water temperature, except period of 16:00-19:00 on October 10, 2006 due to heavy rainfall. The photosynthesis process also well reflects the DO concentration in the Songkhla Lake. It also can be recognized that ANN model results are in a good agreement with the measurement data, proving model’s ability to predict the DO concentration in the Songkhla Lake with a reasonable accuracy.
Nguyen Trung Viet Hitoshi Tanaka Mitsuru Takasaki Hiroto Yamaji Somboon Pornpinatepong Kunlayanee Pornpinatepong
Division of Hydraulic Structures and Transportation Engineering, Deparment of Civil Engineering, Wat Department of Civil Engineering, Tohoku University, 6-6-06 Aoba, Sendai 980-8579, Japan Department of Civil Engineering, Ishinomaki Senshu University, Japan Department of Civil Engineering, Tohoku University, Japan Department of Civil Engineering, Prince of Songkhla University, Thailand. Faculty of Economics, Prince of Songkhla University, Thailand.
国际会议
第四届亚太地区海岸会议(the Fourth International Conference on Asian and Pacific Coasts)
南京
英文
2007-09-21（万方平台首次上网日期，不代表论文的发表时间）