Preliminary Study On Aquatic Ecological Environment Management And Evaluation System In The Estuary

Estuarine areas are the associated link between river ecosystems and marineecosystems, with unique environmental benefits and significant resource potential.There are a series of environmental problems, such as the upstream river sediment,the increasing of pollutants into the sea, the rise in sea level, the reduction of coastalwetlands, the decreasing of biological diversity and so on, which has been affectedby man-made factors greatly. In order to strengthen the management of waterecological environment in the estuary area, it is necessary to realize the managementscientifically and automatically. It is an important task for the ecologicalenvironment protection to establish an evaluation system simple, which has theadvantages of simple operation and the use of effective function.In this paper, the basic database of estuary areas is established based on theMicrosoft Access2003, which has realized the storage and management of massdata. Through using the object-oriented programming language of VB.NET andComGIS of ArcGIS Engine9.2,integrating the SWAT model and the fuzzycomprehensive evaluation model, a GIS-based aquatic ecological environmentmanagement and evaluation system is constructed, which has the function of mapdisplay, data editing, data analysis and data statistics. The integration of SWATmodel and system can realize the runoff simulation in the estuary and understand thereal-time water content; the integration of the fuzzy comprehensive evaluationmodel and system can achieve the evaluation of aquatic ecological environment andexport the aquatic ecological evaluation results simply and intuitively.Database technology, geographic information system, SWAT model and fuzzycomprehensive evaluation are combined into aquatic ecological environmentmanagement and evaluation system, which can realize the basic operation of map.Except that, it can express regional aquatic ecological environment in real-time visually, and take full advantages of GIS in spatial data analysis, data processing,spatial query and management. The system is developed based on these keytechnologies, which has many highlights, such as friendly interaction, accurateforecasting, seamless connectivity, good function extension and so on..After the system is finished, it has tested by taking Dagu River Basin as a testobject, the hydrological simulation module has realized after selectingmeteorological data of Dagu River Basin and hydrological data, and then the usercan know the river flow size; the fuzzy comprehensive evaluation module hasrealized after selecting water quality monitoring data of Dagu River Basin and socialeconomic and ecological data, and then the user can understand the status of theecological environment of river valley. The system has the advantages of intuitiveinterface, easy operation, fast and efficient and so on, which is suitable forpromotional use and able to provide efficient water quality management, scientificand technical support.