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• W2158102701 abstract "Sediment migration modelling at the catchment scale is complicated by various connectivity aspects between sources and sinks, including the extent that sediment generated on hillslopes is connected to a channel and linkage with in a channel network. The So il and Water Assessment Tool (SWAT) is applied within the context of connectivity in a catchment (Mkabela near Wartburg, South Africa) with identified source (cabbage plot) and sink (farm dams and wetlands) zones. The study illustrates SWAT can be applied in scenario analysis to assess connectivity aspects in sediment migration modelling. Scenario analyses establish the extent that sediment outputs from the cabbage plot create input for downstream sub-catchments, as well as the impact of farm dams and wet lands on sediment yield at the catchment scale. SWAT effectively identifies the cabbage plot as an important source of sediment at sub-catchment scale, but the sediment is not spatially identified within the sub-catchment where it is located and all the sediment is modelled to reach the channel, whether connected or not. Despite this, no significant changes are simulated by SWAT at the catchment outlet since increased discharge and sediment load fro m the cabbage plot is counterbalanced by sinks at the catchment scale. The effect of sediment sinks becomes dominant over sediment sources with increasing spatial scale. The channel serves as an important sink zone due to its relatively rough surface conditions. The model also appears to be efficient in representing farm dams as a series of storages where connectivity is reduced at the catchment scale, but sediment deposited in farm dams mainly orig inates fro m surrounding sugarcane fields, not the cabbage plot. SWAT could not correctly identify wetlands as sink zones for cabbage sediment since, in contrary to farm dams, wet lands in SWAT are simu lated off the main channel and water or sediment flowing into the wetlands must originate fro m the sub-catchment in which they are located. The suitability of SWAT for use in connectivity studies is discussed in the context of these findings." @default.
• W2158102701 created "2016-06-24" @default.
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• W2158102701 date "2013-01-01" @default.
• W2158102701 modified "2023-09-26" @default.
• W2158102701 title "Connectivity Aspects in Sediment Migration Modelling Using the Soil and Water Assessment Tool" @default.
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