2022年“龙舟水”期间桂林洪涝时空分布特征研究

Study on the spatial and temporal distribution characteristics of the dragon-boat precipitation in Guilin city in 2022

基于卫星遥感资料,对2022年桂林“龙舟水”期间的水体进行提取,利用GIS空间分析技术,对比2019-2021年洪涝时空分布,探索2022年罕见强“龙舟水”桂林洪涝的时空分布。结果表明,2022年桂林洪涝主要发生在6月,空间分布受地形影响明显,主要分布在湘江、漓江流域,而洛清江相对较轻,整体呈现北多、南少、东多、西少的分布格局。相比2019-2021年,2022年发生洪涝面积与2020年持平,比2019年、2021年更大,且洪涝发生速度比2020年更快。

Based on the remote sensing data from satellites,the spatial and temporal distribution of water bodies in Guilin in 2022 during the dragon-boat precipitation period was extracted,and the flooding was graded according to the frequency of inundation using GIS spatial analysis technology,and the distribution characteristics of flooding in the past three years were compared and analyzed.The results show that the flooding in Guilin in 2022 occurred in June,mainly distributed along with the Xiangjiang River and Lijiang River,and that along with the Luoqing River was relatively light,showing an overall distribution pattern of more in the north,less in the south,more in the east and less in the west.Compared to 2019-2021,the area of flooding that occurred in 2022 was the same as in 2020,larger than in 2019 and 2021,but flooding occurred at a faster rate than in 2020.