Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia

Information on sediment concentration in rivers is important for the design and management of reservoirs. In this paper, river sediment flux and siltation rate of a rift valley lake basin (Lake Ziway, Ethiopia) was modeled using suspended sediment concentration (SSC) samples from four rivers and lak...
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Autor*in:	Alemu O. Aga [verfasserIn] Assefa M. Melesse [verfasserIn] Bayou Chane [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2018

Schlagwörter:	sediment fluxes rating curve lake sedimentation floodplain deposition sediment budget Lake Ziway

Übergeordnetes Werk:	In: Hydrology - MDPI AG, 2015, 6(2018), 1, p 1
Übergeordnetes Werk:	volume:6 ; year:2018 ; number:1, p 1

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/hydrology6010001

Katalog-ID:	DOAJ059841184

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allfieldsSound	10.3390/hydrology6010001 doi (DE-627)DOAJ059841184 (DE-599)DOAJcd72f09100b84a4096852fba29ebd146 DE-627 ger DE-627 rakwb eng Alemu O. Aga verfasserin aut Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Information on sediment concentration in rivers is important for the design and management of reservoirs. In this paper, river sediment flux and siltation rate of a rift valley lake basin (Lake Ziway, Ethiopia) was modeled using suspended sediment concentration (SSC) samples from four rivers and lake outlet stations. Both linear and non-linear least squares log–log regression methods were used to develop the model. The best-fit model was tested and evaluated qualitatively by time-series plots, quantitatively by using watershed model evaluation statistics, and validated by calculating the prediction error. Sediment yield (SY) of ungauged rivers were assessed by developing and using a model that includes catchment area, slope, and rainfall, whereas bedload was estimated. As a result, the gross annual SY transported into the lake was 2.081 Mton/year. Annually, 0.178 Mton/year of sediment is deposited in floodplains with a sediment trapping rate of 20.6%, and 41,340 ton/year of sediment leaves the lake through the Bulbula River. The annual sediment deposition in the lake is 2.039 Mton/year with a mean sediment trapping efficiency of 98%. Based on the established sediment budget with average rainfall, the lake will lose its volume by 0.106% annually and the lifetime of Lake Ziway will be 947 years. The results show that the approach used can be replicated at other similar ungauged watersheds. As one of the most important sources of water for irrigation in the country, the results can be used for planning and implementing a lake basin management program targeting upstream soil erosion control. sediment fluxes rating curve lake sedimentation floodplain deposition sediment budget Lake Ziway Science Q Assefa M. Melesse verfasserin aut Bayou Chane verfasserin aut In Hydrology MDPI AG, 2015 6(2018), 1, p 1 (DE-627)791048659 (DE-600)2777964-6 23065338 nnns volume:6 year:2018 number:1, p 1 https://doi.org/10.3390/hydrology6010001 kostenfrei https://doaj.org/article/cd72f09100b84a4096852fba29ebd146 kostenfrei http://www.mdpi.com/2306-5338/6/1/1 kostenfrei https://doaj.org/toc/2306-5338 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 6 2018 1, p 1
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author	Alemu O. Aga
spellingShingle	Alemu O. Aga misc sediment fluxes misc rating curve misc lake sedimentation misc floodplain deposition misc sediment budget misc Lake Ziway misc Science misc Q Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia
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topic_title	Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia sediment fluxes rating curve lake sedimentation floodplain deposition sediment budget Lake Ziway
topic	misc sediment fluxes misc rating curve misc lake sedimentation misc floodplain deposition misc sediment budget misc Lake Ziway misc Science misc Q
topic_unstemmed	misc sediment fluxes misc rating curve misc lake sedimentation misc floodplain deposition misc sediment budget misc Lake Ziway misc Science misc Q
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title	Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia
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title_full	Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia
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title_sort	estimating the sediment flux and budget for a data limited rift valley lake in ethiopia
title_auth	Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia
abstract	Information on sediment concentration in rivers is important for the design and management of reservoirs. In this paper, river sediment flux and siltation rate of a rift valley lake basin (Lake Ziway, Ethiopia) was modeled using suspended sediment concentration (SSC) samples from four rivers and lake outlet stations. Both linear and non-linear least squares log–log regression methods were used to develop the model. The best-fit model was tested and evaluated qualitatively by time-series plots, quantitatively by using watershed model evaluation statistics, and validated by calculating the prediction error. Sediment yield (SY) of ungauged rivers were assessed by developing and using a model that includes catchment area, slope, and rainfall, whereas bedload was estimated. As a result, the gross annual SY transported into the lake was 2.081 Mton/year. Annually, 0.178 Mton/year of sediment is deposited in floodplains with a sediment trapping rate of 20.6%, and 41,340 ton/year of sediment leaves the lake through the Bulbula River. The annual sediment deposition in the lake is 2.039 Mton/year with a mean sediment trapping efficiency of 98%. Based on the established sediment budget with average rainfall, the lake will lose its volume by 0.106% annually and the lifetime of Lake Ziway will be 947 years. The results show that the approach used can be replicated at other similar ungauged watersheds. As one of the most important sources of water for irrigation in the country, the results can be used for planning and implementing a lake basin management program targeting upstream soil erosion control.
abstractGer	Information on sediment concentration in rivers is important for the design and management of reservoirs. In this paper, river sediment flux and siltation rate of a rift valley lake basin (Lake Ziway, Ethiopia) was modeled using suspended sediment concentration (SSC) samples from four rivers and lake outlet stations. Both linear and non-linear least squares log–log regression methods were used to develop the model. The best-fit model was tested and evaluated qualitatively by time-series plots, quantitatively by using watershed model evaluation statistics, and validated by calculating the prediction error. Sediment yield (SY) of ungauged rivers were assessed by developing and using a model that includes catchment area, slope, and rainfall, whereas bedload was estimated. As a result, the gross annual SY transported into the lake was 2.081 Mton/year. Annually, 0.178 Mton/year of sediment is deposited in floodplains with a sediment trapping rate of 20.6%, and 41,340 ton/year of sediment leaves the lake through the Bulbula River. The annual sediment deposition in the lake is 2.039 Mton/year with a mean sediment trapping efficiency of 98%. Based on the established sediment budget with average rainfall, the lake will lose its volume by 0.106% annually and the lifetime of Lake Ziway will be 947 years. The results show that the approach used can be replicated at other similar ungauged watersheds. As one of the most important sources of water for irrigation in the country, the results can be used for planning and implementing a lake basin management program targeting upstream soil erosion control.
abstract_unstemmed	Information on sediment concentration in rivers is important for the design and management of reservoirs. In this paper, river sediment flux and siltation rate of a rift valley lake basin (Lake Ziway, Ethiopia) was modeled using suspended sediment concentration (SSC) samples from four rivers and lake outlet stations. Both linear and non-linear least squares log–log regression methods were used to develop the model. The best-fit model was tested and evaluated qualitatively by time-series plots, quantitatively by using watershed model evaluation statistics, and validated by calculating the prediction error. Sediment yield (SY) of ungauged rivers were assessed by developing and using a model that includes catchment area, slope, and rainfall, whereas bedload was estimated. As a result, the gross annual SY transported into the lake was 2.081 Mton/year. Annually, 0.178 Mton/year of sediment is deposited in floodplains with a sediment trapping rate of 20.6%, and 41,340 ton/year of sediment leaves the lake through the Bulbula River. The annual sediment deposition in the lake is 2.039 Mton/year with a mean sediment trapping efficiency of 98%. Based on the established sediment budget with average rainfall, the lake will lose its volume by 0.106% annually and the lifetime of Lake Ziway will be 947 years. The results show that the approach used can be replicated at other similar ungauged watersheds. As one of the most important sources of water for irrigation in the country, the results can be used for planning and implementing a lake basin management program targeting upstream soil erosion control.
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title_short	Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia
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Estimating the Sediment Flux and Budget for a Data Limited Rift Valley Lake in Ethiopia

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