Environmental Risk Assessment for the Upper Songkla Lagoon, 1999

Thaweeburus, Parichart Faculty of Environmental Management Prince of Songkla University

Schaefer, Alois, Prof., Institute of Biogeography, University of Saarland, F.R. Germany

Ratanachai, Chatchai Asst. Prof., Faculty of Environmental Management Prince of Songkla University

The 8th International Conference on the Conservation and management of Lakes

(17-21 May 1999), Copenhagen, Denmark


Abstract

 

Regarding the original of the lagoon, its formation could have occurred at least 5,000 years in the phases of Older Peron Transgression and Younger Peron Transgression. Thale Luang can be ecologically characterized by a saprobic stage evaluation based on WQI using factor analysis, showing different level of higher saprobic stage in the eastern than western part. The relations clearly illustrate that light is the most importance limiting factor. On the other hand , the ecological characteristic of Thale Noi was evaluated by the tropic state index. The TSI was then developed based on factor analysis, and indicated seasonal patterns of less to high eutrophication in the overall limiting factor seasonal pattern play a significant role in the ecological state of water. Bioindication using macrozoobenthos and macrophyte is discussed in biogeographical aspects was performed. The sampling site were classified into three groups—eastern, middle and western parts of the lagoon—according to the cluster, coincidence, and factor analyses. Hydrological parameter showed direct impact on lagoonal macrozoobenthos dwellings, while seasonal variations were seen less prominent. The Songkhla Lagoon can be classified into five main risk areas : 1) the connection of Thale Noi and thale Luang, 2) the western part of lagoon, 3) the eastern part of lagoon, 4) the lower part of the lagoon and, 5) the exchange point between lagoonal and sea water.

Keywords : environmental risk assessment, water quality index, tropic state index, bioindication


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