Journal of Resources and Ecology

Chinese Satellite-based Flood Mapping and Damage Assessment in Dongdian Flood Detention Basin, China

LIU Ming, JIN Shengyue, GU Changjun, LI Jingxin, LI Suju, LIU Longfei

Journal of Resources and Ecology, 2024, 15(5): 1344-1357. DOI: 10.5814/j.issn.1674-764x.2024.05.021

Date	Area (km²)	Date	Area (km²)	Date	Area (km²)	Date	Area (km²)
2023-08-01	15.17	2023-08-10	233.58	2023-08-19	226.59	2023-09-03	183.79
2023-08-02	27.51	2023-08-11	246.38	2023-08-20	226.28	2023-09-04	173.09
2023-08-03	73.38	2023-08-12	249.30	2023-08-22	259.86	2023-09-06	237.82
2023-08-04	146.91	2023-08-13	251.98	2023-08-23	221.68	2023-09-11	137.24
2023-08-05	168.94	2023-08-14	247.02	2023-08-24	217.42	2023-09-12	136.20
2023-08-06	190.12	2023-08-15	275.07	2023-08-26	186.98	2023-09-13	104.01
2023-08-07	216.89	2023-08-16	280.36	2023-08-28	199.31	2023-09-14	135.67
2023-08-08	226.64	2023-08-17	222.50	2023-08-29	203.92	2023-09-15	90.57
2023-08-09	262.63	2023-08-18	227.60	2023-08-30	231.06	2023-09-16	69.51

Table 2 Water area extraction results

Other figure/table from this article

Fig. 1 (a) Map depicting the main flood-affected areas in this flooding event; (b) Location map and activation times of seven flood detention basins (FDBs), including ①Daluze, ②Ningjinbo, ③Xianxian, ④Dongdian, ⑤Langouwa, ⑥Xiaoqing River and ⑦Yongding River; (c) Location map of Dongdian FDB
Table 1 Satellite images during the flood disaster process
Fig. 2 Workflow diagram with data sources, analytical process, and output
Fig. 3 Adaptive fine-grained segmentation network model for the building structure diagram
Fig. 4 Sample images from the results of the OTSU approach for the respective visual assessments Note: The blue color indicates the extent of flooding that we mapped.
Fig. 5 Flood extent changes during the rapid expansion phase Note: The orange color in the figure images represents the flooded area, the blue border indicates the scope of the FDB, and the green triangles represent the positions of water intakes.
Fig. 6 Changes in flood extent during the flood recession phase
Fig. 7 Flood duration since the Dongdian FDB opened
Fig. 8 A breach location was identified during the flood recession phase