Model Development: A User's Perspective

Morgan, R. P. C.

doi:10.1002/9781444328455.ch2

Cited by 11 publications

(6 citation statements)

References 42 publications

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“…Now, applying model efficiency coefficient (MEC) into the relation between observed and predicted data (Equation ( 12)), it is found that MEC value of RUSLE is 0.48 (Table 10). The MEC > 0.50-0.70 signifies good and satisfactory performance of model in reference to observed erosion results (Morgan, 2011).…”

Section: Predicted Erosion Rate and Comparisonmentioning

confidence: 75%

“…The model efficiency coefficient (MEC), firstly proposed by Nash and Sutcliffe (1970), is now increasingly used an alternative to the correlation coefficient to express the performance of model (Morgan, 2011). Generally, a MEC value of greater than 0.5 is considered that the model performs satisfactorily in the region, and one should not expect values to exceed 0.7 (Morgan, 2005(Morgan, , 2011.…”

Section: Model Validation and Effectiveness Coefficientmentioning

confidence: 99%

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Geomorphic character and dynamics of gully morphology, erosion and management in laterite Terrain: few observations from Dwarka – Brahmani Interfluve, Eastern India

Ghosh¹,

Guchhait

Illahi³

et al. 2021

Geology, Ecology, and Landscapes

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The most intensified form of soil erosion is the gully which is an extreme figure of land degradation in India, and alongside gully erosion signifies instability in the fragile landscape. The present study encompasses the lateritic interfluve and badlands of Dwarka -Brahmani River Basin (eastern India). The geomorphic research reveals a variable range of annual erosion rates (8.12-24.01 kg m −2 y −1 ) at watershed scale (i.e., three catchments of permanent gullies) using models and field measured data. It is found that the main cause of gully formation is too much runoff water at a certain location of slope -a threshold condition that may be brought about by external factors (land cover) or internal factors (slope). It is found that in the eventbased rainfall range of 42 mm to 137.2 mm the gullies can yield runoff of 40.02 mm to 118.0 mm in excess moisture condition of monsoon. Intense rainfall is the primary trigger, but the local conditions such as slope morphometry, land use, barren soil cover and soil-plant characteristics control the triggering of gully erosion. The potential erosion map of area depicts annual erosion rate beyond the soil tolerance limit (T-value -1.0 kg m −2 y −1 ). Finally it is suggested that reduction of runoff discharge, channel grade, vegetative measures and structural control of gully headcut erosion and sedimentation are the key procedures of erosion protection in the laterite terrain.

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Section: Predicted Erosion Rate and Comparisonmentioning

confidence: 75%

Section: Model Validation and Effectiveness Coefficientmentioning

confidence: 99%

Geomorphic character and dynamics of gully morphology, erosion and management in laterite Terrain: few observations from Dwarka – Brahmani Interfluve, Eastern India

Ghosh¹,

Guchhait

Illahi³

et al. 2021

Geology, Ecology, and Landscapes

View full text Add to dashboard Cite

show abstract

“…USLE, RUSLE) are based on experimental observations and on statistical relations between soil loss and erosion factors. The physical models are more complex, based on mathematical equations which describe the erosion and sedimentation processes integrated by continuity equations to respect the conservation of mass and energy (Morgan, ). The simplicity of the empirical models, compared to the physical ones, is both an advantage, as they are easier to apply and require less input data, and a disadvantage, because the simplified nature of processes may lead to results subject to a higher degree of uncertainty.…”

Section: Methodsmentioning

confidence: 99%

Quantitative assessment of rill and interrill soil erosion in Romania

Patriche

2019

Soil Use and Management

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Soil erosion is an important geomorphological process with potential negative consequences especially on land agricultural potential. Unsuitable agricultural practices may increase soil erosion, leading to rapid loss of soil fertility and decrease of crop production. It is therefore important to correctly quantify soil erosion rates in order to adapt agricultural practices and implement proper conservation measures. This study attempts to assess the rill and interrill erosion in Romania, using the Romanian soil erosion model and GIS techniques. The database includes the digital terrain model, the soil map of Romania, the land use map of Romania and the rainfall erosivity regions. The results show that the high and very high erosion risk classes include 4.1% of the Romanian territory (9,627 km2). Most of this land is present in the hilly and plateau areas (Subcarpathians, Moldavian Plateau, Getic Plateau, Western Hills, Dobrogea Plateau). The model was validated by comparison of its predictions with long‐term erosion measurements from different locations in the country. Comparison with previous non‐GIS assessments of soil erosion at national level shows that the total estimated rill and interrill erosion in our study was very close to previous estimates. Comparison with the RUSLE 2015 model computed for Europe as a whole reveals that the two models assign almost 54% of their shared area to the same erosion class, while for 39% of the territory there is one class difference between the models. The results can be used for evaluations of erosion risk at national and regional scales.

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“…Identification and quantification of the dominant sediment sources are also crucial to identify the most appropriate models to simulate erosion at the catchment scale Morgan, 2011;Vanmaercke et al, 2012) and avoid their misapplication (Govers, 2011). Poor modelling results are frequently obtained when a single model is applied to a wide series of catchments, as most models are generally designed for describing a limited number of processes (either sheet and rill erosion or gully and bank erosion), but they are rarely designed to simulate the complete range of phenomena (De Vente & Poesen, 2005;De Vente et al, 2013;Haregeweyn et al, 2013).…”

Section: Implications For Catchment Managementmentioning

confidence: 99%

Relative Contribution of Rill/Interrill and Gully/Channel Erosion to Small Reservoir Siltation in Mediterranean Environments

et al. 2015

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Reservoir siltation because of water erosion is an important environmental issue in Mediterranean countries where storage of clear surface water is crucial for their economic and agricultural development. The high density of gully systems observed in Mediterranean regions raises the question of their contribution to reservoir siltation. In this context, this study quantified the absolute and relative contributions of rill/interrill and gully/channel erosion in sediment accumulation at the outlet of small Tunisian catchments (0·1–10 km2) during the last 15 years (1995–2010). To this end, a fingerprinting method based on measurements of caesium‐137 and total organic carbon combined with long‐term field monitoring of catchment sediment yield was applied to five catchments in order to cover the diversity of environmental conditions found along the Tunisian Ridge and in the Cape Bon region. Results showed the very large variability of erosion processes among the selected catchments, with rill/interrill erosion contributions to sediment accumulated in outlet reservoirs ranging from 20 to 80%. Overall, rill/interrill erosion was the dominant process controlling reservoir siltation in three catchments whereas gully/channel erosion dominated in the other two catchments. We identified the presence of marly gypsum substrates and the proportion of catchment surface covered by soil management/conservation measures as the main drivers of erosion process variability at the catchment scale. These results provided a sound basis to propose guidelines for erosion mitigation in these Mediterranean environments and suggested to apply models simulating both rill/interrill and gully/channel erosion in catchments of the region. Copyright © 2015 John Wiley & Sons, Ltd.

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Model Development: A User's Perspective

Cited by 11 publications

References 42 publications

Geomorphic character and dynamics of gully morphology, erosion and management in laterite Terrain: few observations from Dwarka – Brahmani Interfluve, Eastern India

Geomorphic character and dynamics of gully morphology, erosion and management in laterite Terrain: few observations from Dwarka – Brahmani Interfluve, Eastern India

Quantitative assessment of rill and interrill soil erosion in Romania

Relative Contribution of Rill/Interrill and Gully/Channel Erosion to Small Reservoir Siltation in Mediterranean Environments

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