Southeast China coastal areas belong to subtropical monsoon climatic zone, thus easily affected by floods resulted from typhoons and rainstorms. Since the areas of river basins are small, rivers flood regulation capac...Southeast China coastal areas belong to subtropical monsoon climatic zone, thus easily affected by floods resulted from typhoons and rainstorms. Since the areas of river basins are small, rivers flood regulation capacities are low, and therefore flood hazard is grave. In this paper, taking the Yongjiang basin in southeast China as an example, the approaches and methods of geographic information system(GIS) applied to flood disaster control and reduction research on small basin are explored. On GIS help the rainfall runoff calculation model and the river channel flood routing model are developed. And the evaluating flood submerged area and the damage assessment models are built supported by digit elevation models. Lastly the decision support system on GIS supported for flood control in research basin has been set up. This greatly improves flood proofing decision making capacities in river basin, and provides valuable information and a mode for flood prevention and reduction in the medium and small basin. Meanwhile, the research indicates that technologies of GIS provide a powerful tool for flood disaster control.展开更多
The flood prevention and mitigation construction of a reservoir is carried out in a river channel, which is greatly affected by flood. According to the construction schedule, the annual flood standard of 5-year flood ...The flood prevention and mitigation construction of a reservoir is carried out in a river channel, which is greatly affected by flood. According to the construction schedule, the annual flood standard of 5-year flood diversion is selected at the initial stage. The corresponding peak flow is 109m3/s, and cofferdam is used to retain water and open diversion channel is flooded. Before the flood season, the upstream cofferdam must reach the elevation of 1043.70 m to reach the flood control standard, and the diversion open channel must reach the flood discharge condition. Therefore, the height of the cofferdam should be raised and drainage measures should be taken to prevent the flood control system of the waterway from being ineffective when the flood disaster occurs. Because the rainy season at the location of the reservoir is long and the rainfall is very abundant, especially the occasional local rainstorm occurs frequently. At the same time, the area is mostly high mountain area and the planting vegetation is difficult to completely resist the rainy season in the area. Therefore, the local rainstorm should be analyzed and the flood control plan should be formulated to avoid the impact of natural disasters such as mud-rock flow and other natural disasters affecting the construction progress and operation. The main content of this paper is how to reduce the flood disaster in flood season and provide some methods for the construction work in flood season.展开更多
文摘Southeast China coastal areas belong to subtropical monsoon climatic zone, thus easily affected by floods resulted from typhoons and rainstorms. Since the areas of river basins are small, rivers flood regulation capacities are low, and therefore flood hazard is grave. In this paper, taking the Yongjiang basin in southeast China as an example, the approaches and methods of geographic information system(GIS) applied to flood disaster control and reduction research on small basin are explored. On GIS help the rainfall runoff calculation model and the river channel flood routing model are developed. And the evaluating flood submerged area and the damage assessment models are built supported by digit elevation models. Lastly the decision support system on GIS supported for flood control in research basin has been set up. This greatly improves flood proofing decision making capacities in river basin, and provides valuable information and a mode for flood prevention and reduction in the medium and small basin. Meanwhile, the research indicates that technologies of GIS provide a powerful tool for flood disaster control.
文摘The flood prevention and mitigation construction of a reservoir is carried out in a river channel, which is greatly affected by flood. According to the construction schedule, the annual flood standard of 5-year flood diversion is selected at the initial stage. The corresponding peak flow is 109m3/s, and cofferdam is used to retain water and open diversion channel is flooded. Before the flood season, the upstream cofferdam must reach the elevation of 1043.70 m to reach the flood control standard, and the diversion open channel must reach the flood discharge condition. Therefore, the height of the cofferdam should be raised and drainage measures should be taken to prevent the flood control system of the waterway from being ineffective when the flood disaster occurs. Because the rainy season at the location of the reservoir is long and the rainfall is very abundant, especially the occasional local rainstorm occurs frequently. At the same time, the area is mostly high mountain area and the planting vegetation is difficult to completely resist the rainy season in the area. Therefore, the local rainstorm should be analyzed and the flood control plan should be formulated to avoid the impact of natural disasters such as mud-rock flow and other natural disasters affecting the construction progress and operation. The main content of this paper is how to reduce the flood disaster in flood season and provide some methods for the construction work in flood season.
