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This paper presents a support the dynamic index system on the hydrological database structure, and how the structure for hydrological data management needs analysis. On this basis, the system is designed and made to achieve. Hydrological database application status, summed up the two aspects of system management indicators curing, can not be expanded; system only supports the preset data analysis mode is not conducive to the analysis of the field of hydro-ecological factors. For the first aspect of the problem, you need a dynamic index system to resolve. Dynamic means that the system is running, the the indicators database management system can be adjusted. Additions and deletions to the index does not require system modification or upgrade, it will not affect the normal operation of the system. The study, hydro-ecological index system is divided into five levels of the ecological component, the index set, indicators, observation items, observation level, and provides a relationship between levels. Mapping these levels and its relationship to the database table structure, making additions and deletions index entry does not affect the structure of the database, only data records additions and deletions. In this way can the system is running dynamic maintenance of the index system. In order to solve the problem of the second aspect of the response to hydrological data query mode to make improvements to enhance the flexibility and customizability. Summarized common hydrological query statistics, will be divided into the basic query, statistical calculations inquiry, three types of comparative analysis of queries, query indicators, single station or stations, time interval, statistical methods, the results show that the forms can be freely combined, making data analysis model is flexible analysis of hydro-ecological field can also be a combination of factors. Further, combining WebGIS technology analyzes the demand for hydro-ecological database functionality into the system management, user management, maintenance stations, the index system maintenance, data maintenance, the six query statistics feature set. Google Maps product as a system of WebGIS platform, and clearly in the hydrological and ecological database application scenarios: address location display, choice of stations, thematic map display. In accordance with the requirements analysis, system design. The system uses WAMP architecture, using MVC pattern. The system to achieve the verification study feasible, demand the right to design effective. Makes the management and use of hydrological data on the hydrological database system based on WebGIS more scientific, more fully, hydro-ecological assessment results will help improve the accuracy and improve the effectiveness of measures.
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