Analysis of Suspended Solid Generation with Rainfall-Runoff Events in a Small Forest Watershed

Kim, Jaehoon; Choi, Hyung-Tae; Lim, Honggeun

doi:10.5322/jesi.2015.24.12.1617

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Because the study sites are affected by monsoon climate, such that its rainfall pattern is not uniform but rather with a lot of extremes, a large amount of sediment is deposited during low rainfall events, and the deposited sediments are washed out by a huge amount of fast stream discharge accompanying heavy rainfall. Temporal lags between the rainfall event and stream discharge are negligible for the Haean catchment, but for suspended sediments, the lags are significant and highly depend on the stream length because of the difference in travel velocities between water and soil particles [73][74][75][76]. Therefore, the model performance for predicting stream discharge may be better than that for predicting suspended sediments.…”

Section: Model Performancementioning

confidence: 99%

Evaluating the Effectiveness of Spatially Reconfiguring Erosion Hot Spots to Reduce Stream Sediment Load in an Upland Agricultural Catchment of South Korea

Choi

Maharjan

Reineking

2019

Water

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Upland agricultural expansion and intensification cause soil erosion, which has a negative impact on the environment and socioeconomic factors by degrading the quality of both nutrient-rich surface soil and water. The Haean catchment is a well-known upland agricultural area in South Korea, which generates a large amount of sediment from its cropland. The transportation of nutrient-rich sediment to the stream adversely affects the water quality of the Han River watershed, which supports over twenty million people. In this paper, we suggest a spatially explicit mitigation method to reduce the amount of sediment yield to the stream of the catchment by converting soil erosion hot spots into forest. To evaluate the effectiveness of this reconfiguration, we estimated the sediment redistribution rate and assessed the soil erosion risk in the Haean catchment using the daily based Morgan–Morgan–Finney (DMMF) model. We found that dry crop fields located in the steep hill-slope suffer from severe soil erosion, and the rice paddy, orchard, and urban area, which are located in a comparatively lower and flatter area, suffer less from erosion. Although located in the steep hill-slope, the forest exhibits high sediment trapping capabilities in this model. When the erosion-prone crop lands were managed by sequentially reconfiguring their land use and land cover (LULC) to the forest from the area with the most severe erosion to the area with the least severe erosion, the result showed a strong reduction in sediment yield flowing to the stream. A change of 3% of the catchment’s crop lands of the catchment into forest reduced the sediment yield entering into the stream by approximately 10% and a change of 10% of crop lands potentially resulted in a sediment yield reduction by approximately 50%. According to these results, identifying erosion hot spots and managing them by reconfiguring their LULC is effective in reducing terrestrial sediment yield entering into the stream.

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Section: Model Performancementioning

confidence: 99%