6月29日,甘肃省兰州市出现今年首场大到暴雨天气,榆中水岔沟降水量达51.9毫米。市气象局依托国债气象项目新建的兰州市水旱灾害防御气象服务系统,精准研判中小河流沟道上下游雨情,首次实现具体到沟道的山洪预警提示。
兰州市水旱灾害防御气象服务系统,精准定位了可能发生山洪的沟道 卢品睿供图针对此次过程,市气象局提前两天发布重大气象专报,提前5小时发布强对流和暴雨预警,同时联合应急管理、自然资源、水务、住房和建设等部门发布地质灾害、中小河流洪水和城市积涝风险预警,提前3小时“叫应”市委、市政府和相关部门应急责任人,提前1小时精准锁定榆中县宛川河克涝沟、兴隆河、徐家峡河、龛谷河及西固区咸水河流域,提醒短时强降水可能引发山洪。接收气象信息后,水务部门立即发布山洪预警,撤离河道人员,封闭过水路面。当日14时,榆中宛川河流域下游因短时强降雨发生超警洪水,洪峰流量达170立方米/秒。由于预警发布及时、落区预报精准、部门联动迅速,此次暴雨洪水未造成人员伤亡。
据了解,市水旱灾害防御气象服务系统集成雷达回波、地面雨量监测、格点预报产品,通过研判上下游雨情,可实现精准量化中小河流洪水风险等级,并将预警提示落区精细到具体沟道,实现气象、应急管理、水务、自然资源等多部门实时联动,合力筑牢防灾减灾救灾安全堤坝。
(作者:卢品睿 责任编辑:郭曼如)
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