RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2007, Vol. 16 >> Issue (1): 1-6.

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RISK FORECAST OF ALGAL BLOOM |IN THE THREE GORGES RESERVOIR

LI Chongming1,2, HUANG Zhenli1,3,ZHANG Sheng2, CHANG Jianbo1   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-01-20

Abstract:

The relationship between total phosphorus (TP), water clarity (SD, called Secchi disk depth) and chlorophylla in the Three Gorges Reservoir Area-including 16 tributaries and 35 big or middle reservoirs in Chongqing City-was studied. The chlorophylla concentration in the Three Gorges Reservoir Area after impoundment was predicted by using the TP and Chlorophylla relationship based on the present TP concentrations in 40 branch stream estuaries at dry seasons in 1998. The trend of eutrophication in the Three Gorges Reservoir was analyzed by the predicted chlorophylla concentration. It is shown that the reservoirs at tributary rivers, most of which were in a high trophic status, exhibited a good relationship between chlorophylla concentration and TP concentration and water clarity. In some natural branches such as Wujiang river, the concentration of TP and chlorophylla showed no obvious relationship even in algal bloom condition. It is shown that the current status is the key reason for water eutrophication in the Three Gorges Reservoir Area. It is predicted that algal bloom may occur in some water areas in the reservoir after the completion of Three Gorges Project.

Key words: Three Gorges Reservoir, chlorophylla, total phosphorus, algal bloom

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