The Design And Implementation On Geographic Environment For WATLAC Hydrological Model Integration

Mathematical modeling can be widely used by hydrologists in various fields to study water environment due to its complete structure and the advantage that can quickly and truly analyze and simulate the hydrologic process.However,due to the complex nature of water environment modeling,it is limited by the separated processing and various input/output parameters,which affects its universality,timeliness and convenience in implementation.As a typical water environment mathematical modeling,the distributed watershed hydrological model WATLAC can not only reflect the impact of rainfall,evaporation,and the spatial distribution of underlying surface on lake basins,but also simulate basin water balance and runoff processes between surface and subsurface.However,there are also limitations in practical application and sharing aspect,such as time-consuming data collection,discrete processing,high professional requirements,and decision support.As the new generation of GIS,the Virtual Geographic Environment(VGE)canbridge the gap between scientific research and practical applications,sharing models,data as well as results.At the same time,the central theories and techniques,such as dynamic information of multi-source heterogeneous sensors,automatic loading and fusion,space-time data activation and integration correlation analysis,integrated geoprocess simulation provides a comprehensive theoretical support for hydrologic model simulation,which can solve the limitations of the traditional water environment mathematical modeling in application and sharing.Therefore,this study explored a virtual geo-environmental platform based on WATLAC distributed hydrological model,which respectively introduced the principles of WATLAC hydrological model,multi-source data preparation,modeling processes and methods and sharing of results.In addition,based on WATLAC hydrologic model a set of open system named "Lake Basin Hydrologic Process and Lake Water Change Simulation and Monitoring" was designed and developed.The study introduced a VGE-based platform,interactive design,system function design and integrated key technology.Upon complement,the system was tested with the observation data from the five tributary rivers of the Pyang Lake watershed between 2000 and 2005.The results show that:(1)The input sample data can run successfully on the designed hardware and software platform.The results obtained are consistent with those obtained via traditional WATLAC model;(2)Users can quickly obtain hydrologic simulation results by inputting data;(3)The system can be embedded into two and three dimensional scenarios to connect the modules between previous process,over running process and final process,which can enhance the users' visual immersion;(4)Interaction between different actors(e.g.,users,researchers and government decision makers)helped break barriers of geographic location and provide a platform to overcome limitations of traditional distributed hydrological models in terms of data sharing,model sharing and results sharing.