Estimation of 1 km Grid-based WATEM/SEDEM Sediment Transport Capacity Using 1 Minute Rainfall Data and SWAT Semi-distributed Sediment Transport Capacity Results for Han River Basin of South Korea

Abstract. When assessing the total sediment yield of a watershed through sediment transport from soil erosion process, the ratio of sediment delivery is a critical and uncertain factor during modelling. This study is to estimate watershed scale sediment yield distribution of 1 km by 1 km spatial resolution with the evaluation of RUSLE (Revised Universal Soil Loss Equation) rain erosivity (R factor) for 14 years (2000–2013) using 1 minute data from 16 rainfall gauging stations in Han River basin (34,148 km2) of South Korea. The WATEM/SEDEM sediment delivery algorithm based on RUSLE R, soil erodibility K, length-slope LS factors was adopted. The average R factor values of 1 minute for the basin were evaluated as 3,812 MJ/ha mm/year. To determine the 1 km grid-based KTC (transport capacity coefficient generally given as 100) for the WATEM/SEDEM sediment transport estimation, the SWAT (Soil Water Assessment Tool) MUSLE (Modified USLE) results from 181 sub-watersheds (from 50 km2 to 300 km2) were used. The SWAT simulated suspended solids versus observed ones at 7 locations showed average R2 (determination of coefficient) of 0.72. Using the SWAT sediment yields, the spatial KTC based on 60 minutes R factor was determined at each sub-watershed from 0.16 to 142.6 with average value of 12.7 for the whole basin.

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Assessment of Climate Change Impacts on the Future Hydrologic Cycle of the Han River Basin in South Korea Using a Grid-Based Distributed Model

Irrigation and Drainage ◽

10.1002/ird.1963 ◽

2016 ◽

Vol 65 ◽

pp. 11-21 ◽

Cited By ~ 8

Author(s):

So Ra Ahn ◽

Seong Joon Kim

Keyword(s):

Climate Change ◽

South Korea ◽

River Basin ◽

Climate Change Impacts ◽

Hydrologic Cycle ◽

Distributed Model ◽

Han River ◽

The Future ◽

Han River Basin ◽

Grid Based

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EROSIVE PROCESS CONTROL IN THE BRAZILIAN SEMIARID REGION

Revista Caatinga ◽

10.1590/1983-21252018v31n319rc ◽

2018 ◽

Vol 31 (3) ◽

pp. 695-703

Author(s):

JÚLIO CÉSAR NEVES DOS SANTOS ◽

EUNICE MAIA DE ANDRADE ◽

HELBA ARAÚJO DE QUEIROZ PALÁCIO ◽

JOSÉ RIBEIRO DE ARAÚJO NETO ◽

JACQUES CARVALHO RIBEIRO FILHO

Keyword(s):

Sediment Transport ◽

Sediment Yield ◽

Spatial Scales ◽

Principal Component ◽

Semiarid Region ◽

Transport Capacity ◽

Antecedent Soil Moisture ◽

Rainfall Events ◽

Sediment Transport Capacity ◽

Runoff Depth

ABSTRACT The adoption of measures to prevent and control erosive processes requires information about the factors affecting the erosion and the sediment transport conditions. However, the sediment yield of a basin depends on the availability of eroded material and the sediment transport capacity. Thus, the objective of this study was to identify the factors that affect the sediment transport capacity at different spatial scales in an area with caatinga vegetation. The study was carried out in the Iguatu Experimental Basin, in the state of Ceará, Brazil, from 2009 to 2014, by monitoring two scale levels: watershed with 2.06 ha, and erosion plot with 20 m². The variables evaluated for the rainfall events were precipitation, intensity of rainfall, antecedent soil moisture, precipitation of the antecedent five days, consecutive dry days, peak flow, runoff depth, and sediment yield. During the study period, 263 rainfall events (>2 mm) and 86 events generating runoff were recorded. Three Principal Components (PC) were developed using the Principal Component Analysis, which explained more than 79% of the total variance. Variables connected to the kinetic energy capacity of the rainfall to disaggregate soil particles, the energy for sediment transport, and the soil water content were framed in the CP1, CP2, and CP3, respectively. In the evaluated scales, the sediment yield presented a high correlation with the runoff depth, which indicates limiting conditions for sediment yield by the mass flow energy.

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