GIS-based lake sediment budget estimation taking into consideration land use change in an urbanizing catchment area

Kim, S. M.; Jang, Taeil; Kang, Moon‐Seong; Im, Sangjun; Park, S. W.

doi:10.1007/s12665-013-2621-7

Cited by 20 publications

(12 citation statements)

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“…These functions have been declining especially in the developing world due to rapid population growth that has accelerated land degradation, increasing the amount of sediment and nutrient transported by rivers [2]. Most of the sediment is deposited in floodplains, lakes, and reservoirs [3]. Deposited materials consist of inorganic and organic materials with adsorbed nutrients and contaminants and can threaten the sustainability of lakes [4,5].…”

Section: Introductionmentioning

confidence: 99%

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

et al. 2020

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Sediment concentration of rivers in developing countries has been increasing greatly over the last 50 years due to the conversion of forest to continuously cultivated land with the increasing population. Few studies have addressed its effect on sedimentation and water quality of the lakes by analyzing bottom sediment characteristics. In this study, the objective was to investigate the spatial distribution (and their interrelationships) of the bottom sediment characteristics in the largest lake in Ethiopia, Lake Tana where water hyacinths have been spreading rapidly during the last decade. Sediment samples were collected from the lake bottom at 60 locations and analyzed for texture, organic matter, total nitrogen, and available phosphorus. Bottom sediment samples had a median of 75% clay, 13% silt, and 9% sand. Clay was greatest in the northwestern part and smallest in the areas near the major rivers entering or exiting the lake. Clay percentage and lake depth were strongly correlated. The mean organic matter content of bottom sediment was 16 g kg−1, total nitrogen 0.8 g kg−1, and Olsen available phosphorus 19 mg kg−1. Phosphorus concentrations peaked where water hyacinths were found in the northeastern part of the lake. This study will serve as a baseline for future water quality and sedimentation changes in Lake Tana. In particular, it might aid in explaining the spread of the water hyacinths.

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Section: Introductionmentioning

confidence: 99%

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

et al. 2020

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Section: Introductionmentioning

confidence: 99%

“…Many lakes in the world have lost significant usable volume as a result of sedimentation (Kim et al, 2014). However, lake sedimentation has been studied less than any other major environment on Earth (Johnson, 1984;Colman and Foster, 1994;Kim et al, 2014). Hence, sedimet budgeting for lakes is useful to identify the dominant processes in a catchment and the rate at which these processes are operating (Kim et al, 2014), and comprises identification and quantification of the sources, pathways and sinks of eroded material within a catchment (Slaymaker, 2003;Walling and Collins, 2008).…”

Section: Introductionmentioning

confidence: 99%

Revisiting lake sediment budgets: How the calculation of lake lifetime is strongly data and method dependent

Lemma

Admasu

Dessie

et al. 2017

Earth Surf Processes Landf

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Lake sedimentation has a fundamental impact on lake lifetime. In this paper, we show how sensitive calculation of the latter is to the quality of data available and assumptions made during analysis. Based on the collection of a large new dataset, we quantify the sediment masses (1) mobilized on the hillslopes draining towards Lake Tana (Ethiopia), (2) stored in the floodplains, (3) transported into the lake, (4) deposited in the lake and (5) delivered out from the lake so as to establish a sediment budget. In 2012–2013, suspended sediment concentration (SSC) and discharge measurements were made at 13 monitoring stations, including two lake outlets. Altogether, 4635 SSC samples were collected and sediment rating curves that account for land cover conditions and rainfall seasonality were established for the 11 river stations, and mean monthly SSC was calculated for the outlets. Effects of the floodplain on rivers' sediment yield (SY) were investigated using measurements at both sides of the floodplains. SY from ungauged rivers was assessed using a model that includes catchment area and rainfall, whereas bedload and direct sediment input from lake shores were estimated. As a result, the gross annual SY was c. 39.55 (± 0.15) Mt, dominantly from Gilgel Abay and Gumara Rivers. The 2.57 (± 0.17) Mt sediment deposited in floodplains indicate that the floodplains serve as an important sediment sink. Moreover, annually c. 1.09 Mt of sediment leaves the lake through the two outlets. Annual sediment deposition in the lake was c. 36.97 (± 0.22) Mt and organic matter accumulation was 2.15 Mt, with a mean sediment trapping efficiency of 97%. Furthermore, SSC and SY are generally higher at the beginning of the rainy season because soils in cultivated fields are bare and loose due to frequent ploughing and seedbed preparation. Later in the season, increased crop and vegetation cover lead to a decrease in sediment production. Based on the established sediment budget with average rainfall, the lifetime of Lake Tana was estimated as 764 to 1032 years, which is shorter than what was anticipated in earlier studies. The sedimentation rate of Lake Tana (11.7 ± 0.1 kg m−2 yr−1) is in line with the sedimentation rates of larger lakes in the world, like Lake Dongting and Lake Kivu. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Many lakes in the world have lost significant usable volume as a result of sedimentation (Kim et al, 2014). However, lake sedimentation has been studied less than any other major environment on Earth (Johnson, 1984;Colman and Foster, 1994;Kim et al, 2014). Hence, sedimet budgeting for lakes is useful to identify the deminant processes in a catchment and the rate at which these processes operate (Kim et al, 2014), and comprises identification and quantification of the sources, pathways and sinks of eroded material within a catchment (Slaymaker, 2003;Walling and Collins, 2008).…”

Section: Introductionmentioning

confidence: 99%

Retracted: Revisiting lake sediment budgets: how the calculation of lake lifetime is strongly data and method dependent

2017

Earth Surf Processes Landf

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The above article, first published online in Wiley Online Library (wileyonlinelibrary.com), and in Earth Surface Processes and Landforms on 19th February 2017 (10.1002/esp.4111), has been retracted by agreement between theauthors, the journal Editor‐in‐Chief, Stuart Lane, and John Wiley & Sons Ltd.The retraction has been agreed due to calculation errors which could constitute an environmental hazard if not corrected. Since publication of the above article, several colleagues have brought to the attention of the authors that the presented sediment budget is inconsistent with suspended sediment concentrations reported in the same manuscript. This was not picked up during the review or the editing process. The authors have revisited the huge measured dataset on which this paper is based and found indeed a systematic error in calculations of sediment fluxes, as they had been using a wrong constant in conversions from water pressure data recorded every ten minutes and suspended sediment concentration to annual sediment transport rates. This has resulted in an underestimation of sediment transport rates by all rivers by an order of magnitude.The authors apologise for these calculation errors, and, with agreement of all parties, it was decided that the appropriate corrective action is retraction of this paper. A new corrected version will be submitted to the journal. We apologise for any inconvenience the premature publication of this work may have caused our readers. Reference

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GIS-based lake sediment budget estimation taking into consideration land use change in an urbanizing catchment area

Cited by 20 publications

References 40 publications

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

Bottom Sediment Characteristics of a Tropical Lake: Lake Tana, Ethiopia

Revisiting lake sediment budgets: How the calculation of lake lifetime is strongly data and method dependent

Retracted: Revisiting lake sediment budgets: how the calculation of lake lifetime is strongly data and method dependent

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