Inferring mean rates of sediment yield and catchment erosion from reservoir siltation in the Kruger National Park, South Africa: An uncertainty assessment

Reinwarth, Bastian; Petersen, Robin; Baade, Jussi

doi:10.1016/j.geomorph.2018.09.007

Cited by 10 publications

(21 citation statements)

References 39 publications

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“…An infiltration surface presence also causes the increase of infiltration rate because the channel walls are absorbent. The silt pit was the form of water and soil conservation technology (Reinwarth et al 2019). The mechanical conservation method was the embankments constructed across the slope to intercept surface runoff and protect soil erosion.…”

Section: Erosion and Surface Runoffmentioning

confidence: 99%

“…The effectiveness of organic C and reducing nutrient loss indicated that some of them are carried away by runoff to the silt pit. The silt pit cut short the slope and reduced sediment runoff (Reinwarth et al 2019). The highest runoff and erosion occurred on the plot without silt pit treatment (Table 1) because the speed and the transportation capacity were higher in sloping areas.…”

Section: The Nutrient Lossmentioning

confidence: 99%

“…Meanwhile, other parts receive carbon. Silt pit can be used to control the organic C loss by execution on sloping land (Reinwarth et al 2019). A silt pit is an orifice or cross-sectional area (Moradi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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The Effectiveness and Valuation of Using Silt Pit to Reduce Erosion and Nutrient Loss of Andosol

et al. 2022

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The silt pit is a method of soil management that functions to accommodate and absorb surface runoff. The research aimed to determine the silt pit effectiveness for erosion reduction and nutrient loss. The research is located at 576 above sea level (asl) in Sukamantri village, Taman Sari district, Bogor Regency. The experiment used a randomized block design with three replications and a slope group. The treatments were R0 (without silt pit); R1 (silt pit); R2 (silt pit + mulch); R3 (silt pit + mulch + biopore tube), R4 (silt pit + mulch + biopore tube + vertical crop tube). The highest runoff-decreasing occurred on R4 treatment, which pressed down 29.38% runoff. The highest value of erosion-decreasing occurred on R2 as 68.74% and followed by effectiveness in reducing the loss of 71% Organic C, 76% available P, and 67% total N. The dry seeds peanut yield was around 0.54 - 0.86 Mg ha-1, dried pods was 0.96 - 1.33 Mg ha-1, and dried biomass was 5.16 - 6.23 Mg ha-1 and not significantly different between all treatments. This study recommends that farmers apply silt pit innovation technology with a combination of mulch, biopore, and mature green media because the incremental B/C ratio was 1.175. It is a good economic indicator for farmers.

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Section: Erosion and Surface Runoffmentioning

confidence: 99%

Section: The Nutrient Lossmentioning

confidence: 99%

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The Effectiveness and Valuation of Using Silt Pit to Reduce Erosion and Nutrient Loss of Andosol

et al. 2022

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“…In South Africa, the longest record of reservoir sedimentation was 65 years for a 420 ha catchment. (Reinwarth et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Sediment deposition (1940–2017) in a historically pristine lake in a rapidly developing tropical highland region in Ethiopia

Kebedew

Tilahun

Belete

et al. 2021

Earth Surf Processes Landf

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Accelerated sediment concentration has become a pervasive feature in developing countries and has substantially impacted lake ecosystem functioning. Despite this, very few comprehensive studies have examined the changes in sedimentation over the time that agriculture intensified greatly with the increasing population. This study aims to fill this gap using historical and recent bathymetric surveys to determine sediment deposition and link these to watershed development. With its unique ecology, Lake Tana that was pristine less than 100 years ago, is one of these systems experiencing increasing sediment concentrations. A detailed bathymetric survey was conducted in late 2017 and compared with bathymetric surveys conducted in 1940, 1987, and 2006. The result shows that in the past 77 years, Lake Tana's depth decreased an average of 28 ± 11 cm, equivalent to nearly 0.9 ± 0.4 Tg (million tons).Sediment deposition was 2.8 ± 2.3 mm a À1 between 1940 and 1987, when the agricultural intensification started. It almost doubled to 5.0 ± 3.7 mm a À1 after that.Spatially, the sediment deposition was most significant in areas near the major river inlets where 2 to 10 km long peninsulas were formed. The increase in sediment deposition is primarily driven by newly formed valley bottom gullies formed after deforestation disturbed the hydrological equilibrium, and watershed outflow increased.

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“…Over recent decades, many researchers have assessed catchment SSYs using bathymetric surveys or sediment pit analysis of reservoir sediments over various spatial and temporal scales (de Vente et al, ). For example, on the basis of surveys of reservoir sediment volumes, Reinwarth, Petersen, and Baade () estimated SSY values for 15 small (≤100 km 2 ) reservoir catchments in the southern Kruger National Park since dam construction. de Vente, Verduyn, Verstraeten, Vanmaercke, and Poesen () calculated SSYs from 61 catchments (ranging in area between 29 and 13,248 km 2 ) in Spain and examined factors controlling sediment yield at the catchment scale in NW Mediterranean agroecosystems.…”

Section: Introductionmentioning

confidence: 99%

Dating reservoir deposits to assess the recently changing sediment yields from a medium‐sized agricultural catchment

Long

Lu²,

Pei³

et al. 2019

Land Degrad Dev

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Medium‐sized catchments exhibit different patterns of sediment yield than small catchments and large river basins (taking scale dependency into account) and play in soil loss from upstream areas with downstream sediment transportation over larger spatial scales than small catchments. Few studies have used reservoir depositional records to assess historical sediment yields at the scale of a medium‐sized catchment. By analyzing six cores obtained from reservoir deposits, this investigation reconstructed the recent sediment yield from a medium‐sized agricultural catchment (the Xujiaya catchment in Northern China) and examined the changing pattern of sediment yield over the past 57 years. The cores were dated using the 137Cs and 210Pbex methods. The historical specific sediment yields (SSYs) were estimated based on the original reservoir capacity curve and the depositional chronology modeled using a composite chronological model based on the constant rate of supply (CRS) approach (i.e., the C‐CRS model). The mean SSYs estimated from the six cores over each of seven short stages (i.e., 1959–1963, 1964–1972, 1973–1980, 1981–1989, 1990–1997, 1998–2007, and 2008–2016) defined over the 57‐year study period ranged between 4.6 ± 1.8 and 16.2 ± 6.3 t ha−1 yr−1, with a mean value of 8.1 ± 3.2 ha−1 yr−1 for all seven stages, and this mean value can be used to broadly represent the sediment yield from the catchment since dam construction. These SSY values are relatively high, reflecting intense agricultural disturbance and the underlying lithology. The values were highest for the 1959–1963 stage and lowest in the following stage of 1964–1972 and then generally increased over the successive stages of 1973–1980, 1981–1989, and 1990–1997 before decreasing slightly during the last two stages after 1997. This change was driven mainly by human activity over the past 57 years. The results indicate that the environmental factors (e.g., human activity and lithology) influencing sediment yield in a medium‐sized catchment are more complicated than those affecting a small catchment and reveal the characteristic pattern of sediment yield in medium‐sized catchments.

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Inferring mean rates of sediment yield and catchment erosion from reservoir siltation in the Kruger National Park, South Africa: An uncertainty assessment

Cited by 10 publications

References 39 publications

The Effectiveness and Valuation of Using Silt Pit to Reduce Erosion and Nutrient Loss of Andosol

The Effectiveness and Valuation of Using Silt Pit to Reduce Erosion and Nutrient Loss of Andosol

Sediment deposition (1940–2017) in a historically pristine lake in a rapidly developing tropical highland region in Ethiopia

Dating reservoir deposits to assess the recently changing sediment yields from a medium‐sized agricultural catchment

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