关键词: 地质灾害, 实时预警预报, 有效降雨量, 临界降雨量, 降雨强度, 减灾防灾, WEBGIS

Abstract: Based on WEBGIS platform, the paper presents a real-time warning system for regional geological hazards in Zhejiang Province which is formulated with precipitation and its forecasting data and geological hazard investigation data. The system concludes four subsystems: subsystem of geological hazard management; subsystem of spatial prediction and time warning; subsystem of application in illustrative regions and subsystem of hazard reduction and prevention. The main purposes are (1) to establish systematic digital geological hazard management of individual and regional geological hazard information including data and maps according to the subsystem of geological hazard system, which can serves for decision-making in administrative ways; (2) to establish a real-time regional geological hazard warning system in Internet which is strongly connected with weather information center. The warning information of Zhejiang Province is released timely through Web net in raining seasons. The key part of this system is geological hazard prediction and warning modes, which is realized with the combination of regional geological hazard zonation and dynamic weather information. This system is run during the rain season from May to July of 2004. It is evaluated by in-site geological hazard inventory that practical geological hazards are mostly occurred within the warned high risk areas, which gives good confidences of the models and system operations.

Key words: geological hazard, real-time warning, effect rainfall, threshold values of rainfall, rainfall intensity, protection and reduction of geological hazards, WEBGIS