论文部分内容阅读
利用1998～2005年资料对堵河流域面雨量、流域内主要水文站点的流量及堵河下游的黄龙滩水库坝前水位等气象水文要素进行全面分析,给出了堵河流域致洪暴雨标准,分析堵河流域致洪暴雨时空分布特征和环流形势特征。结果表明:①堵河流域致洪暴雨主要为连续性强降水,具有持续时间长的特点。②堵河中上游的西南部及竹溪泉河、竹山官渡河地区对流域降水贡献最大,其次是竹溪河地区。③堵河流域致洪暴雨发生的有利环流特征为:西太平洋副高位置适合;700 hPa在副高和大陆高压间形成东北～西南向幅合带,西南地区低涡发展东移;850 hPa高原南部低值系统发展并逐日东移至重庆地区,在堵河流域附近形成低涡或切变。物理量场特征为:暴雨前高原地区及堵河流域以南地区增暖明显,影响冷空气以偏东路径为主;暴雨925～500 hPa在30～40°N为NEE～SWW走向的等θse密集带,水汽辐合逐渐有利于堵河流域暴雨的发生。
Based on the data of 1998-2005, the meteorological and hydrological factors such as the surface rainfall in the drainage area, the flow in the main hydrological stations in the drainage area and the water level in front of the dam of the Huanglongtan reservoir in the downstream of the blockage were analyzed comprehensively, Analysis of spatiotemporal distribution and circulation characteristics of torrential rain caused by flood in the Duan River Basin. The results show that: ①The heavy rainstorm caused by heavy rainfall in the Duanhe River Basin is mainly continuous heavy rainfall with the characteristics of long duration. (2) The southwestern part of the middle and upper reaches of the Mudao River, the Zhuxiquan River and the Guandu River in Zhushan contributed the most to the precipitation in the basin, followed by the Zhuxihe area. (3) The favorable circulation characteristics of heavy rain caused by flood in the drainage area are as follows: the position of the subtropical high in the western Pacific is suitable; the northeast ~ southwest toxin zone is formed between the subtropical high and the continental high 700 hPa, while the low vortex develops to the east in the southwest; The development of the low value system in the southern part of the country moved eastward to the area of Chongqing on a daily basis, forming a vortex or shear near the Duan River. The characteristics of the physical field are as follows: the warming in the plateau before the heavy rainfall and in the area south of the Dousha basin is significant, and the influence of the northeastern path is mainly on the cold air; and the 977 ~ 500 hPa at 30 ~ 40 ° N is the θse dense of NEE ~ SWW Belt, water vapor convergence is gradually conducive to blocking the occurrence of heavy rain in the river basin.