DOI: 10.1016/j.jag.2013.08.001
Scopus记录号: 2-s2.0-84897907629
论文题名: Evaluating suitability of MODIS-terra images for reproducing historic sediment concentrations in water bodies: Lake Tana, Ethiopia
作者: Kaba E ; , Philpot W ; , Steenhuis T
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 26, 期: 1 起始页码: 286
结束页码: 297
语种: 英语
英文关键词: Getis-Ord Gi
; Lake tana
; MODIS
; TSS
Scopus关键词: best management practice
; concentration (composition)
; conservation management
; developing world
; fluvial deposit
; image analysis
; MODIS
; remote sensing
; Terra (satellite)
; turbidity
; Ethiopia
; Gumara River
; Lake Tana
英文摘要: Government and NGO funded conservation programs are being implemented in developing countrieswith the potential benefit of reduced sediment inflow into fresh water lakes. However, these claimsare difficult to verify due to limited historical sediment concentration data in lakes and rivers. Remotesensing can potentially aid in monitoring sediment concentration. With almost daily availability overthe past ten years and consistent atmospheric correction applied to the images, Moderate Resolution Imaging Spectroradiometer (MODIS) 250 meter images are potential resources capable of monitoringfuture concentrations and reconstructing historical sediment concentration records. In this paper, site-specific relationships are developed between reflectance in near-infrared (NIR) images and three factors:total suspended solids (TSS), turbidity and Secchi depth for Lake Tana near the mouth of the GumaraRiver. The first two sampling campaigns on November 27, 2010 and May 13, 2011 are used in calibration.Reflectance in the NIR varies linearly with turbidity (R2= 0.89) and TSS (R2= 0.95). Secchi depth fit best toan exponential relation with R2 of 0.74. The relationships are validated using a third sample set collectedon November 7, 2011 with RMSE of 11 Nephelometric Turbidity Units (NTU) for Turbidity, 16.5 mg l-1 for TSS and 0.12 meters for Secchi depth. The MAE was 10% for TSS, 14% for turbidity and 0.1% for Secchidepth. Using the relationship for TSS, a 10-year time series of sediment concentration in Lake Tana near theGumara River was plotted. It was found that after the severe drought of 2002 and 2003 the concentrationin the lake increased significantly. The results showed that MODIS images are potential cost effective toolsto monitor suspended sediment concentration and obtain a past history of concentration for evaluatingthe effect of best management practices. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79645
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY, United States; Department of Civil and Environmental Engineering, Cornell University, Ithaca, NY, United States; School of Civil and Water Resources Engineering, Bahir Dar University, Bahir Dar, Ethiopia; Geospatial Data and Technology Center, Bahir Dar University, Bahir Dar, Ethiopia
Recommended Citation:
Kaba E,, Philpot W,, Steenhuis T. Evaluating suitability of MODIS-terra images for reproducing historic sediment concentrations in water bodies: Lake Tana, Ethiopia[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,26(1)