Academic Journal
A global lake and reservoir volume analysis using a surface water dataset and satellite altimetry
| العنوان: | A global lake and reservoir volume analysis using a surface water dataset and satellite altimetry |
|---|---|
| المؤلفون: | Busker, Tim, de Roo, Ad, Gelati, Emiliano, Schwatke, Christian, Adamovic, Marko, Bisselink, Berny, Pekel, Jean-Francois, Cottam, Andrew |
| بيانات النشر: | Copernicus Publications |
| سنة النشر: | 2019 |
| المجموعة: | Niedersächsisches Online-Archiv NOA (Gottfried Wilhelm Leibniz Bibliothek Hannover) |
| مصطلحات موضوعية: | article, Verlagsveröffentlichung |
| الوصف: | Lakes and reservoirs are crucial elements of the hydrological and biochemical cycle and are a valuable resource for hydropower, domestic and industrial water use, and irrigation. Although their monitoring is crucial in times of increased pressure on water resources by both climate change and human interventions, publically available datasets of lake and reservoir levels and volumes are scarce. Within this study, a time series of variation in lake and reservoir volume between 1984 and 2015 were analysed for 137 lakes over all continents by combining the JRC Global Surface Water (GSW) dataset and the satellite altimetry database DAHITI. The GSW dataset is a highly accurate surface water dataset at 30 m resolution compromising the whole L1T Landsat 5, 7 and 8 archive, which allowed for detailed lake area calculations globally over a very long time period using Google Earth Engine. Therefore, the estimates in water volume fluctuations using the GSW dataset are expected to improve compared to current techniques as they are not constrained by complex and computationally intensive classification procedures. Lake areas and water levels were combined in a regression to derive the hypsometry relationship (dh ∕ dA) for all lakes. Nearly all lakes showed a linear regression, and 42 % of the lakes showed a strong linear relationship with a R2 > 0.8, an average R2 of 0.91 and a standard deviation of 0.05. For these lakes and for lakes with a nearly constant lake area (coefficient of variation < 0.008), volume variations were calculated. Lakes with a poor linear relationship were not considered. Reasons for low R2 values were found to be (1) a nearly constant lake area, (2) winter ice coverage and (3) a predominant lack of data within the GSW dataset for those lakes. Lake volume estimates were validated for 18 lakes in the US, Spain, Australia and Africa using in situ volume time series, and gave an excellent Pearson correlation coefficient of on average 0.97 with a standard deviation of 0.041, and a normalized RMSE of ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | electronic |
| اللغة: | English |
| Relation: | Hydrology and Earth System Sciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2100610 -- http://www.hydrol-earth-syst-sci.net/volumes_and_issues.html -- 1607-7938; https://doi.org/10.5194/hess-23-669-2019; https://noa.gwlb.de/receive/cop_mods_00003251; https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003209/hess-23-669-2019.pdf; https://hess.copernicus.org/articles/23/669/2019/hess-23-669-2019.pdf |
| DOI: | 10.5194/hess-23-669-2019 |
| الاتاحة: | https://doi.org/10.5194/hess-23-669-2019 https://noa.gwlb.de/receive/cop_mods_00003251 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003209/hess-23-669-2019.pdf https://hess.copernicus.org/articles/23/669/2019/hess-23-669-2019.pdf |
| Rights: | https://creativecommons.org/licenses/by/4.0/ ; uneingeschränkt ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.34D087FA |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/hess-23-669-2019 |
|---|