Real-Time Warning System of Regional Landslides Supported by WEBGIS and its Application in Zhejiang Province, China

As one of the provinces of highest economic growth in coastal China, Zhejiang Province is experiencing serious geological disasters during the past development of economy, which are mainly induced by intensive rainfall during typhoon season or by long-term rainfall from May to June every year. Thus, supported by WEBGIS, a real-time warning system of regional landslides is studied. According to the characteristic of rainfall in Zhejiang province, the study divides the province into typhoon region and non-typhoon region, using statistic approach to study the correlation of regional landslides hazards and rainfall, rainfall intensity of typhoon region and non-typhoon region. By correlation analysis, effective rainfall model is defined, and the thresholds of effective rainfall and rainfall intensity are obtained. Combining these thresholds with spatial prediction production of landslides hazards, predictive models for landslide warning of Zhejiang Province are established. Then a real-time warning system of regional landslides explored by WEBGIS software is successfully developed considering both regional geology and rainfall process information.