Fig. 1. The ISWs on MODIS optical remote sensing images. The insert map is the grey image of a single ISWs and the spatial profile of the leading wave which indicated by the red box

Fig. 2. Two-dimensional topography of South China Sea

Fig. 3. The topological structure of the BP neural network

Fig. 4. ISWs observed in the MODIS image at 11:15 (UTC+8), Wenchang area, on May 14, 2005

Fig. 5. Isotherm profile of the measured position in Wenchang on May 14, 2005

Fig. 6. 南海北部海域内孤立波振幅分布Amplitude distribution of ISWs in the South China Sea

Fig. 7. 南海北部内孤立波振幅与水深关系Relationship between the depth of water and amplitudes of ISWs in the South China Sea

Fig. 8. MODIS内孤立波图像，红点为内孤立波提取位置The ISWs on MODIS optical remote sensing images. The red dot is the extracted positions of ISWs

Fig. 9. 单条内孤立波的振幅分布The amplitudes distribution of ISWs, and the colored dots indicate the amplitude position

Fig. 10. 内孤立波振幅与水深关系Relationship between the depth of water and amplitudes of ISWs