Mechanism of Gully-Head Retreat - A Study at Ganganir Danga, Paschim Medinipur, West Bengal

Shit, PK; Maiti, R K

doi:10.4314/ejesm.v5i4.2

Cited by 21 publications

(14 citation statements)

References 12 publications

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“…The average angle of internal friction for all gully heads was 0.4 m m −1 (22°), which is greater than the ground surface slope of 0.05 m m −1 above the gully head cut (Table ). The difference between these two slopes indicates that the initiation of gullies must be caused by an internal instability of the soil materials rather than slope instability at the head cuts (Shit & Maiti, ). Internal instability of gullies exists when the friction angle is less than 35° with the vertical saturated, and near saturated, soils (Bradford et al , ).…”

Section: Resultsmentioning

confidence: 99%

Gully Head Retreat in the Sub‐Humid Ethiopian Highlands: The Ene‐Chilala Catchment

et al. 2017

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In the northern highlands of Ethiopia, gully erosion is severe. Despite many efforts to implement gully prevention measures, controlling gully erosion remains a challenge. The objective is to better understand the regional gully erosion processes and to prevent gully head retreat. The study was conducted in the Ene‐Chilala catchment in the sub‐humid headwaters of the Birr River located southwest of Bahir Dar, Ethiopia. Twelve gully heads were monitored during the 2014 and 2015 rainy monsoon phase. We measured gully head morphology and retreat length, soil shear strength, ground water table levels, and catchment physical characteristics. Two active gully head cuts were treated in 2014 and an additional three head cuts in 2015 by regrading their slope to 45° and covering them with stone riprap. These treatments halted the gully head advance. The untreated gullies were actively eroding due to groundwater at shallow depths. The largest head retreat was 22.5 m, of which about half occurred in August of the first year when the surrounding soil was fully saturated. Lowering both the water table and protecting the gully heads can play a key role in reducing gully expansion and soil loss due to gully erosion in the Ethiopian highlands. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Gully Head Retreat in the Sub‐Humid Ethiopian Highlands: The Ene‐Chilala Catchment

et al. 2017

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“…Both concentrated runoff, falls and topples are enhanced by the occurrence of desiccation cracks (due to shrink/swell dynamics of expandable clays) and tension cracks developed during dry seasons (Pulice et al 2009). The presence of tension cracks on top of gully sides often tends to increase falling phenomena (Collison 2001;Bull and Kirkby 2002;Poesen et al 2002;Shit and Maiti 2012a).…”

Section: Discussionmentioning

confidence: 99%

Modeling of potential gully erosion hazard using geo-spatial technology at Garbheta block, West Bengal in India

Shit¹,

Paira

Bhunia³

et al. 2015

Model. Earth Syst. Environ.

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The gully erosion is the most serious environmental problem in West Bengal in India. Present study focused on delineation the gully affected areas and characterization of geo-environmental factor in the gully affected region to prevent future problems. Ground investigation and geo-spatial data along with bivariate statistical approach were employed to identity the most crucial factors among lithology, dynamic and slope inclination, landuse, aspect, plan curvature, stream power index, topographical wetness index and length-slope factor and also understand the most dominant class of each factor associated the gully erosion in the area under study. All the information were integrated into geographical information system platform and categorized in zones of very high, high, moderate, and low gully erosion susceptibility. Weight index overlay method is used to validate the gully proneness map. Results showed land use factor (barren land and waste land), slope ([20°), topographical wetness index values ([1.2), length-slope index ([4.00), fragments of pebbles, boulder and gravels, older alluvium and lateritic soil play important roles in gully processes. Model validation indicated that the resulting map of areas prone to gully erosion has a prediction accuracy of 88.25 %. The methodology adopted for gully erosion proneness mapping can be exercised in other gully vulnerability areas that could be an excellent approach to defend the natural resources and progress in the land use conservation.

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“…This region is a part of residual Chhotonagpur plateau with undulating relief, laterite soil and humid climate. Physiographically, the region can be categorized into three parts, viz Chotonagpur flanks with hills, and rolling lands in the western part, Rahr plain with lateritic uplands in the middle part (Shit et al 2012;Gayen et al 2013). The soil is mainly sandy loam type and the average land slope varied between 5 and 8 %.…”

Section: Description Of the Study Areamentioning

confidence: 99%

Soil erosion risk mapping using RUSLE model on jhargram sub-division at West Bengal in India

Shit¹,

Nandi

Bhunia³

2015

Model. Earth Syst. Environ.

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An appraisal of spatial and quantitative information on soil erosion is a major challenge for human sustainability. The present study demonstrates the prognostic modeling capabilities of geo-spatial technology based on soil erosion potential model to assess the effects of implementing land use changes within sub-tropical region in India. The Revised Universal Soil Loss Equation (RUSLE) integrated with geo-spatial technology was used to produce predictive soil erosion map. Rainfall pattern, soil type, topography, crop system and management practices and geo-spatial data were used to predict the soil erosion model. Results shows 74.77 % of the study area is marked as low potential zone for soil erosion, whereas 5.58 % ([10 t h -1 year -1 ) is very high erosion risk zone. The present information may help recognizing areas that are vulnerable to soil loss and the proposed method will be used for generalized planning and assessment purposes for supervision and preserve the soil erosion.

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Mechanism of Gully-Head Retreat - A Study at Ganganir Danga, Paschim Medinipur, West Bengal

Cited by 21 publications

References 12 publications

Gully Head Retreat in the Sub‐Humid Ethiopian Highlands: The Ene‐Chilala Catchment

Gully Head Retreat in the Sub‐Humid Ethiopian Highlands: The Ene‐Chilala Catchment

Modeling of potential gully erosion hazard using geo-spatial technology at Garbheta block, West Bengal in India

Soil erosion risk mapping using RUSLE model on jhargram sub-division at West Bengal in India

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