|Title:||Assessment of hydrological changes in inland water body using satellite altimetry and Landsat imagery: A case study on Tsengwen Reservoir||Authors:||Lee, Chi-Ming
Kuo, Chung -Yen
|Keywords:||Landsat imagery;Satellite altimetry;Water level;Water volume||Issue Date:||1-Dec-2022||Publisher:||ELSEVIER||Journal Volume:||44||Source:||JOURNAL OF HYDROLOGY-REGIONAL STUDIES||Abstract:||
Study region: Tsengwen Reservoir, Taiwan. Study focus: Water level (WL) and water volume (WV) are important indicators for analyzing surface water resources. Satellite remote sensing enables continuous monitoring of inland water bodies in human-inaccessible areas. We integrate Landsat imagery and satellite altimetry to derive long-term (2003-2020) WL and WV variations of Tsengwen Reservoir. First, water area (WA) was extracted from Landsat imagery by Modified Normalized Difference Water Index method and a second-order regression model is proposed to recover the entire WA from cloud -covered images to enhance the data usage. Then, WAs and WLs provided from satellite altimetry are utilized to build a linear regression model which is used to transfer WA into WL. Finally, WV was computed based on the WA and WL. New hydrological insights for the region: Results showed that the usage rate of Landsat-8 imagery utilized for conversion from WA to WL can be increased from 23% to 43%. Moreover, the root -mean-square error of the difference of WLs between the estimates and a local gauge is 2.95-5.56 m, with correlation coefficients (CC) of 0.93-0.99. In addition, the derived WV variations and ground truth showed a good agreement with CC in 0.88-0.97. The results indicated that the integration of multi-source remote sensing technologies can effectively provide long-term hydrological parameters to assist administrative agencies with an appropriate plan for water re-sources management.
|Appears in Collections:||通訊與導航工程學系|
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