Design And Applied Analysis Of Debris Flow Hazard Database Based On GIS

The shaping and developing disciplines of debris flow hazard are very complicated due to the fact that they depend on the combined effects of terrain, geology, weather, engineering and people's activity, etc. Meanwhile, the debris flow data contain remarkable spatial character and complex attribute information. How to save, manage, exchange and make the best of the hazard data effectively? Because the failure of resolving the problem based on the solo traditional database management system (DBMS) , an advanced solution based on the latest geographic information system (GIS) is called up.In the past years, GIS has been applied extensively in every walk of life for its strengthened functions for data procession, i.e. spatial data storing, querying, analyzing and managing. Thus using GIS technique to manage the debris flow hazard's spatial data would be a suitable method.Based on the wholly design of the debris flow hazard database, this thesis begins with setting up the debris flow hazard graph database with MAPGIS tool. following the work flows, i.e. vectorization, graphic edit, error adjustment and map collection. Then attribute database is set up with Microsoft Access. And more, the conjunction of graph and data is realized seamlessly by setting a main-keyword in the database. Which more, the debris flow hazard information system is set up by Visual BASIC and Maplnfo tools, which realizes the debris flow hazard's management, query, statistical analysis, etc. Lastly, the correlated data selected from the system to realize auto-forecast for the debris flow hazard (e.g. risk analysis), and discuss spatial analysis for the debris flow hazard, which includes terrain analysis, overlay analysis, buffer analysis to uncover shaping rules of the debris flow hazard. At the same time, experimental data set is imported to the debris flow hazard database to validate the debris flow hazard database's reliability, feasibility, etc.The thesis discusses the theories related to debris flow hazard database design and analysis, as to find a solution to manage data effectively. And some useful conclusions and experiences in the process of system design andrealization are offered in the end.