Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations

Exploring how watershed partition influences hillslope and channel sediment in the Soil & Water Assessment Tool is important to identify the partition threshold and improve the model application in soil erosion evaluation. However, the influences on the channel phase, and the partition thres...

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Autores principales:	Bingqing Lin, Dejian Zhang, Xingwei Chen, Huaxia Yao
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Channel sediment routing Partition threshold Watershed partition SWAT Xixi basin Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/362574b59ea745d79ec1c326cc4e6f77
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spelling	oai:doaj.org-article:362574b59ea745d79ec1c326cc4e6f772021-12-01T04:35:26ZThreshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations1470-160X10.1016/j.ecolind.2020.107111https://doaj.org/article/362574b59ea745d79ec1c326cc4e6f772021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20310505https://doaj.org/toc/1470-160XExploring how watershed partition influences hillslope and channel sediment in the Soil & Water Assessment Tool is important to identify the partition threshold and improve the model application in soil erosion evaluation. However, the influences on the channel phase, and the partition threshold for the entire watershed sediment process have not yet been well addressed. The Xixi basin located in southeast China was taken as an example with thirteen partition levels. Based on the idea of separating the simulations of the hillslope and channel phases, the partition threshold for channel sediment routing was identified according to changes in the parameters of channel sediment routing and the spatial distributions of channel deposition under different partition levels with two newly proposed indicators. This allowed the partition threshold of the entire watershed sediment process to be determined by comparing the thresholds for channel and hillslope sediment. The results indicate that (1) watershed partition has a substantial influence on the spatial distributions of channel deposition, and increasing sub-watersheds decreases the spatial variations of channel deposition. However, the influences can be obscured at the watershed outlet by changing channel routing parameters. (2) The changes in channel sediment routing are primarily due to the sensitivity of the channel dimensions in the model to watershed partition, which alter the hydraulic radius until a partition threshold, at which point the mean sub-watershed size is 2.4% of the total watershed area. (3) The thresholds for hillslope sediment generation and channel sediment routing are different, and the threshold for effectively simulating the entire watershed sediment process mainly depend on the hillslope sediment phase with a mean sub-watershed size of approximately 1.6% of the total watershed area.Bingqing LinDejian ZhangXingwei ChenHuaxia YaoElsevierarticleChannel sediment routingPartition thresholdWatershed partitionSWATXixi basinEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107111- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Channel sediment routing Partition threshold Watershed partition SWAT Xixi basin Ecology QH540-549.5
spellingShingle	Channel sediment routing Partition threshold Watershed partition SWAT Xixi basin Ecology QH540-549.5 Bingqing Lin Dejian Zhang Xingwei Chen Huaxia Yao Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations
description	Exploring how watershed partition influences hillslope and channel sediment in the Soil & Water Assessment Tool is important to identify the partition threshold and improve the model application in soil erosion evaluation. However, the influences on the channel phase, and the partition threshold for the entire watershed sediment process have not yet been well addressed. The Xixi basin located in southeast China was taken as an example with thirteen partition levels. Based on the idea of separating the simulations of the hillslope and channel phases, the partition threshold for channel sediment routing was identified according to changes in the parameters of channel sediment routing and the spatial distributions of channel deposition under different partition levels with two newly proposed indicators. This allowed the partition threshold of the entire watershed sediment process to be determined by comparing the thresholds for channel and hillslope sediment. The results indicate that (1) watershed partition has a substantial influence on the spatial distributions of channel deposition, and increasing sub-watersheds decreases the spatial variations of channel deposition. However, the influences can be obscured at the watershed outlet by changing channel routing parameters. (2) The changes in channel sediment routing are primarily due to the sensitivity of the channel dimensions in the model to watershed partition, which alter the hydraulic radius until a partition threshold, at which point the mean sub-watershed size is 2.4% of the total watershed area. (3) The thresholds for hillslope sediment generation and channel sediment routing are different, and the threshold for effectively simulating the entire watershed sediment process mainly depend on the hillslope sediment phase with a mean sub-watershed size of approximately 1.6% of the total watershed area.
format	article
author	Bingqing Lin Dejian Zhang Xingwei Chen Huaxia Yao
author_facet	Bingqing Lin Dejian Zhang Xingwei Chen Huaxia Yao
author_sort	Bingqing Lin
title	Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations
title_short	Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations
title_full	Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations
title_fullStr	Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations
title_full_unstemmed	Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations
title_sort	threshold of watershed partition in swat based on separating hillslope and channel sediment simulations
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/362574b59ea745d79ec1c326cc4e6f77
work_keys_str_mv	AT bingqinglin thresholdofwatershedpartitioninswatbasedonseparatinghillslopeandchannelsedimentsimulations AT dejianzhang thresholdofwatershedpartitioninswatbasedonseparatinghillslopeandchannelsedimentsimulations AT xingweichen thresholdofwatershedpartitioninswatbasedonseparatinghillslopeandchannelsedimentsimulations AT huaxiayao thresholdofwatershedpartitioninswatbasedonseparatinghillslopeandchannelsedimentsimulations
_version_	1718405835427676160

Threshold of watershed partition in SWAT based on separating hillslope and channel sediment simulations

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