The Spatial Information System to Predict Regional Debris Flow

摘要

Applied remote sensing and GIS, a spatial information system to predict regional debris flow has been established for Lower Jinshajiang River Basin (called as MFPIS). The key points of the prediction information system are: first, using remote sensing, to investigate the debris flows and their geologic and geomorphic conditions in the whole region, and to judge the danger-degree of debris flow of each small sub-region; second, to study the correlativity of rain-triggered factors and danger-degree with the occurrence of debris flow; third, using GIS, to convert the continuous hydrometeoric information, such as precipitation, evaporation and rain forecast, into the rain-trigger indexes for each small sub-region, and to integrate them with danger-degree of each sub-region. It forms a dynamic spatial information system, to predict the debris flow in each sub-region. In MFPIS, the "debris flow occurring index" Id is suggested to predict debris flow directly. The trial operation of MFPIS shows that the occurrences of debris flow are correlated to Id closely. It also shows that the remote sensing investigation and the judgment of the danger-degree of debris flow are the basis of the prediction; to forecast the rainstorm center accurately is the key of the accurate prediction of debris flow.