Abstract:

With the vigorous development of Shanghai’s economy，a number of marine projects have built in the Shanghai waters，causing fragmentation of habitats，biodiversity decline，and other ecological damage.For analyzing the ecological damage caused by the marine projects，this paper took the Yangtze River estuary in Shanghai waters tunnelbridge engineering as an example and chose the ecological survey data in Spring and Autumn of 2007.After the period of bridging，comparing the survey data between spring and autumn，it showed that every index would lean to be adverse.On the basis of structural and functional indicator system and of Analytic Hierarchy Process (AHP)，the result showed that the value of comprehensive health indicator of the Yangtze River Estuary Bridge project in waters near the tunnel were 2043 and 2166 in Spring and Autumn of 2007,respectively.According to 〖WTBX〗CHI〖WTBZ〗≤3，the project water ecosystem was located unhealthy and near subhealthy.It showed that the natural properties of estuary ecosystem varied obviously，biodiversity declined and the structure of ecosystem changed a lot，and the primary ecological service functions were degenerating seriously or disappearing.In the face of the habitat which was destroyed by marine engineering，it needs to take more and longtime manual intervention,and  some effective plans of ecosystem conservation and restoration of habitat should be put forward.

Key words: marine engineering/ecological damage/structure and function of evaluation index system/analytic hierarchy process/comprehensive health index