Spatial distribution of soil erosion and suspended sediment transport rate for Chou-Shui river basin

Lin, Chin-Ping; Chen, Ching‐Nuo; Wang, Yumin; Tsai, Chih‐Heng; Tsai, Chen‐An

doi:10.1007/s12040-014-0484-2

Cited by 6 publications

(4 citation statements)

References 19 publications

(17 reference statements)

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“…Sediment inlet and discharge boundary conditions were computed from a 1-dimensional numerical model, the Physiographic Soil Erosion Deposition (PSED). It has well been validated in several studies such as Lin, et al [10], Chen, et al [11], Wu, et al [12] etc. It divides the watershed into several computational cells using ArcGIS (shown in Fig.…”

Section: Numerical Modelsmentioning

confidence: 82%

Evaluating an optimum slit check dam design by using a 2D unsteady numerical model

Chen

Tfwala

2018

E3S Web Conf.

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Debris flow could be catastrophic to residents and property located at their downstream. As a result, engineers have designed several structural countermeasures, such as check dams. Regardless of the many investigations on check dams, uncertainty with respect to their design is still persistent. Against this backdrop, the study aims to assess the efficiency and determine an optimal design of slit check dams for mitigating debris flow and sediment-laden flows in steep channels. The study uses an actual slit check dam located at Landao creek, a tributary to the Beng-gai River in the central range of Taiwan. The creek has an average slope of 7 degrees, while its d50 is approximately 100 mm. Steep slopes, extreme precipitation, poor geologic formations, debris flow and landslides characterise the catchment. Concerning the slit check dam design; there were six rectangular concrete piers (width = 1.5 m, length = 4 m, depth = 8 m), linearly spaced at 1 m in a 180° alignment layout, with the middle 2 piers height reduced by 2.5 m. We evaluated the performance of this configuration and further tested two additional configurations by cutting a single pier and three piers at the centre in a 2D model, Nays-2DH. Hydrograph of a selected storm was used for upstream boundary conditions. Surveys using an unmanned aerial vehicle were conducted pre- and post-storm events to validate numerical solutions. Scour and deposition profiles from the different pier configurations formed the basis of our assessment. The numerical computations yielded valuable results and may provide better understanding in the optimal design of slit check dams. Our findings are of paramount importance to engineers and decision makers with regard to debris flow mitigation, especially in a typhoon prone region like Taiwan.

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Section: Numerical Modelsmentioning

confidence: 82%

Evaluating an optimum slit check dam design by using a 2D unsteady numerical model

Chen

Tfwala

2018

E3S Web Conf.

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“…In the soil erosion-deposition simulation for the watershed, simulations for slope cells and river cells were calculated separately. The sediment transport rate and river bed erosion profile of each cell were simulated by using the suspended load equation (Equation 2), the river bed variation continuity equations (Equation 3) [26], and the river bed load transport equation.…”

Section: The Physiographic Soil Erosion-deposition Model (Psed Model)mentioning

confidence: 99%

Climate Change Impacts on Soil Erosion and Sediment Yield in a Watershed

Chen

Tfwala

Tsai

2020

Water

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This study analyzed the influence of climate change on sediment yield variation, sediment transport and erosion deposition distribution at the watershed scale. The study was based on Gaoping River basin, which is among the largest basins in southern Taiwan. To carry out this analysis, the Physiographic Soil Erosion Deposition (PSED) model was utilized. Model results showed a general increase in soil erosion and deposition volume under the A1B-S climate change scenario. The situation is even worsened with increasing return periods. Total erosion volume and total sediment yield in the watershed were increased by 4–25% and 8–65%, respectively, and deposition volumes increased by 2–23%. The study showed how climate change variability would influence the watershed through increased sediment yields, which might even worsen the impacts of natural disasters. It has further illustrated the importance of incorporating climate change into river management projects.

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“…In Taiwan, the situation is similar. The majority of studies were conducted on plot-to-watershed scales [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. There was just one simplified analysis of island-wide soil erosion, which was part of an "emergy" evaluation to investigate the environmental impact of changing the agriculture production system [25].…”

Section: Introductionmentioning

confidence: 99%

Soil Erosion in Taiwan

Chen,

Nguyen,

Huang

2023

Agriculture

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Soil erosion is a complex process involving material detachment, transportation (mainly by water, occasionally by wind), and eventual deposition when energy wanes. Human activities like tillage and construction can exacerbate soil erosion. Various forms of water erosion, such as sheet erosion, pedestal erosion, rills, piping, and gullying, are recognized. This pioneering study aims to comprehensively model water erosion across Taiwan at a 20 m spatial resolution, a departure from previous research focusing on smaller scales. Using the Revised Universal Soil Loss Equation (RUSLE) model, it seeks to examine the significant issue of soil erosion in Taiwan beyond agricultural areas and enable cross-regional comparisons. A large number of stations and the most recent data were used to establish the distributions of the rainfall runoff erosivity factor and the soil erodibility factor. In addition, we used the Google Earth Engine (GEE) to calculate the Normalized Difference Vegetation Index (NDVI) and a locally derived empirical equation to compute the cover-management factor. The topographic factor was determined using the System for Automated Geoscientific Analyses (SAGA). The support practice factor was analyzed using two different methods using datasets on World Urban Areas and Global Urban Boundaries from the literature. The analysis showed that despite the difference in the support practice factor, Taiwan’s resulting average yearly soil erosion rates are very similar (200.7 Mg ha−1 year−1 and 207.4 Mg ha−1 year−1). The amounts were validated against five watersheds that were instrumented with erosion pins. With prediction ratios ranging from 1.04 to 1.82 across four of the five watersheds, our findings provide empirical support for the alignment of our model with soil erosion pin measurements, especially within the Tsengwen reservoir watershed. However, it is noteworthy that these results also exhibit a tendency towards conservative estimations in the remaining watersheds. Our calculated estimate, falling within the range of 201–207 Mg ha−1 year−1, plausibly represents the upper limit of mean soil erosion in Taiwan. This assertion is predicated on the deliberate omission of local soil conservation measures from our study, a decision necessitated by the absence of comprehensive and detailed island-wide data. Despite this limitation, our results instill confidence in the robustness of our methodological approach, thereby suggesting that our estimation of soil erosion in Taiwan provides a reliable approximation.

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Spatial distribution of soil erosion and suspended sediment transport rate for Chou-Shui river basin

Cited by 6 publications

References 19 publications

Evaluating an optimum slit check dam design by using a 2D unsteady numerical model

Evaluating an optimum slit check dam design by using a 2D unsteady numerical model

Climate Change Impacts on Soil Erosion and Sediment Yield in a Watershed

Soil Erosion in Taiwan

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