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在地质灾害详细调查的基础上,基于GIS平台以地质灾害点密度为依据生成初步地质灾害易发性区划图。从诱发地质灾害的内部因素出发将地层岩性、地形坡度、地貌类型、植被覆盖率、多年降雨量分级后,叠加到初步易发性区划图中,生成了地质灾害气象预警区划基图。以降雨作为诱发地质灾害的主导外在因素,重新对泾川县进行了地质灾害气象预警区划,在重点预警区及次重点预警区采用临界日综合有效过程降雨量模型判据法,开展地质灾害气象预警预报研究。通过实际发布预警信息的检验结果来看,从总体上取得了较好的预报效果,该方法符合该区的实际情况,简捷、实用、有效,为进一步研究陇东黄土区地质灾害气象预警提供科学依据。
Based on the detailed investigation of geological disasters, based on the GIS platform, the preliminary geological zoning zoning map is generated based on the geological disaster point density. Based on the internal factors of induced geological disasters, stratigraphy lithology, topographic gradient, landform types, vegetation coverage and years of rainfall are graded, and then added to the initial susceptibility zonation map to generate the base map of the pre-warning regionalization of geological disasters. Taking rainfall as the leading external factor in inducing geological disasters, we carried out the rezoning of Jingchuan County to the geological disasters meteorological pre-warning zoning. In the key early warning areas and the sub-key warning areas, the criterions of comprehensive effective process rainfall model critical date were used to carry out geological disasters Research on Weather Forecast and Forecast. According to the test results of the actual release of early warning information, the forecast result is generally good. The method accords with the actual situation of the area, which is simple, practical and effective, and provides scientific information for further studying the meteorological early warning of geological disasters in Loess Area of East Gansu in accordance with.