Shang- Shu Shih

Taiwan International Institute for Water Education (TIIWE)

(Corresponding Author: d90521017@ntu.edu.tw)

Tong-Jer Hu

Department of Civil Engineering, Lan-Yang Institute of Technology

Pin-Han Kuo

Taiwan International Institute for Water Education (TIIWE)

(Speaker: No.1, Sec.4, Roosevelt Road, Hydrotech Research Institute of Taiwan University, Tel:+886-2-33662605, Fax.:+886-2-33665866, e-mail:gwowen@ms16.hinet.net )

Jin-Hao Yang

Department of Civil Engineering, Taiwan University

Abstract£ºThe eco-based water quality investigation consists of biotic organisms, e.g. fish, aquatic insect, alga, and the abiotic water quality, e.g., DO, BOD, S.S., electronic conductivity and so on. The eco-based water quality investigation results were examined the current ecological state of Jian-Chi-Chei confluence with modified ISC model. The results show that the scores of hydrology and streamside plant are relatively low which indicate the negative impact on longitudinal continuity because of reservoirs and dams along the river and only very few plants or grassland in the streamside. Among the five sub-indices, water quality reveals the highest score. Tidal effects, which influence the conductivity, may be the reason of this contradictive result. Since the DO and BOD factors, which may be more important, are not considered, the current ISC may not be able to represent the water quality properly.

Keywords£ºeco-based water quality investigation, modified ISC model