IMPACT OF WEST TO EAST SEA WATER DIVERSION PROJECT ON GROUNDWATER QUALITY IN XIAMEN ISLAND

D rastically in fluenced by hum an activ ities, the w ater qua lity of theM iddle Lake of X iamen Island has been seriously polluted. In order to allev iate w ater pollution of the lake, a projectw as planned. It is the sea wa ter diversion pro ject from w est to eas.t The pro ject w ill change groundw ater environm en.t The most important the im pact in on the g round w ater environm ent o f the who le island. W ill the pro ject improvew ater qua lityw ithout causing ex tra prob lem s? W ill it decrease sea w ater invasion, groundw ater- seaw ater interaction, and nutriment reciproca t ion betw een freshw ater bodies and seaw ater as w el?l By adopting the F in ite E lementMethod, a conceptualmode l is set up to ana lyze groundw ater flow and sea w ater transportation w ith a mathem atica lmode.l The conclusions are ( 1) in annual average precip itation years, the sea w ater invasion w ill persist in one year after the pro ject is fin ished, and ( 2) seaw ater levelw ill be c lose to adjacent place on the lakeside. Consequently, theremay be, in low w ater years, reverse supply o f seaw ater to lake w ater through g roundw ater f low, w hich w ill cause salinity rise, w a ter quality decline, and deterio ration of drink ing w ater sources o f som e areas