南方丘陵区流域提取及洪水淹没模拟——以赣江上游为例

发布时间：2018-11-12 15:00

【摘要】：赣江上游流域处亚热带季风气候和丘陵地形区,洪水多发。论文基于GIS知识与技术,应用Arc Hydro Tools工具,从栅格型DEM上提取水系,划分子流域和水系等级,并分析流域特征;应用空间分析工具,通过种子蔓延算法,求低于一定高程的有源洪水淹没范围,并计算淹没面积;最后与行政区图叠合分析,确定实际淹没范围。结果显示:(1)运用GIS技术和知识提取赣江流域信息速度快、准确度高;(2)基于水位且有源的洪水淹没模拟在赣江上游丘陵区具有较好的适用性,种子蔓延算法在数据量不大的赣江上游研究区效率较高;(3)提取的赣江上游水系及流域信息较准确;(4)淹没区与实际区域叠合分析,发现宁都与石城交界处更易发生洪灾,且琴江北岸淹没范围较大。
[Abstract]:In the upper reaches of the Ganjiang River, the subtropical monsoon climate and hilly terrain are frequently flooded. Based on the knowledge and technology of GIS, this paper uses Arc Hydro Tools tools to extract water system from grid type DEM, divide subbasin and water system grade, and analyze watershed characteristics. By using spatial analysis tools and seed spreading algorithm, the range of active flood submergence below a certain height is obtained, and the submergence area is calculated. Finally, the actual inundation range is determined by superposition analysis with the map of the administrative region. The results show that: (1) using GIS technology and knowledge to extract information from Ganjiang River basin is fast and accurate; (2) the flood flooding simulation based on water level and active source has good applicability in the hilly area of the upper Ganjiang River, and the seed spreading algorithm is more efficient in the study area of the upper Ganjiang River where the amount of data is not large; (3) the information of the upper reaches of Ganjiang River and the river basin is more accurate, (4) the inundated area is superimposed with the actual area, and it is found that the border between Ningdu and Shicheng is more prone to flood, and the north bank of Qinjiang River has a large submergence range.
【作者单位】：赣南师范大学地理与规划学院;
【基金】：国家自然科学基金资助项目(41561020)
【分类号】：TV122

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