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Das, Tapan Kumar
- Stress on Embankment as Negative Feedback in the System of Reclaimed Sundarban-A Case Study along the Raimangal
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Authors
Affiliations
1 Dept. of Geography and Environment Management, Vidyasagar University, Paschim Medinipur, West Bengal, 721102, IN
1 Dept. of Geography and Environment Management, Vidyasagar University, Paschim Medinipur, West Bengal, 721102, IN
Source
Indian Science Cruiser, Vol 24, No 1 (2010), Pagination: 24-27Abstract
In an environment of active delta building through the interaction of hydrologic, atmospheric and tidal processes, the intervention through erection of embankments closer to the tidal channels for reclamation of the inter-tidal areas sets a serious impact on system dynamics which are adjusted through embankment breaching. High tide becomes swifter and higher indicating the potentiality of overtopping and erosion. This reclamation makes the channels hydraulically ‘unfit’ and those are gradually narrowed down. It provokes in complete closure of the interior channels through construction of series of longitudinal and transverse embankments and completes occupying of the channel areas for fishing, cultivation and habitation. The increased hydraulic head of 0.43m allows an additional 167309 m3 more flood water to enter into the reclaimed area through a representative breach of 7.65m plan length of curved breach crest, 4.32m height of the tide level from the base of embankment and 4.86m hydraulic head on breach crest at breach channel centerline. Geotechnical analysis shows that the embankment materials may get stability at the repose angle of 2°, but in many cases, the slope on the embankment exceeds 50° that indicates absolute internal instability of the materials.Keywords
Reclamation, Embankment, Tidal Asymmetry, Drainage Decay, Breaching.
- Geospatial Comparison of Three Models to Predict Soil Properties in Semi-Humid Region of West Bengal, India
Abstract Views :335 |
PDF Views:8
Authors
Rajaram Majhi
1,
Gouri Sankar Bhunia
2,
Tapan Kumar Das
3,
Pravat Kumar Shit
4,
Rabindranath Chattopadhyay
5
Affiliations
1 Department of Geography, F.M. University, Balasore, Orissa, IN
2 Bihar Remote Sensing Application Centre, IGSC Planetarium, Bailer Road, Patna-800001, IN
3 Department of Geography, Cooch Behar College, Cooch Behar, West Bengal, IN
4 Department of Geography, Raja N.L.Khan Women’s College, Gope Palace, Medinipur 721102, West Bengal, IN
5 Regional Development Center, IIT, Kharagpur, IN
1 Department of Geography, F.M. University, Balasore, Orissa, IN
2 Bihar Remote Sensing Application Centre, IGSC Planetarium, Bailer Road, Patna-800001, IN
3 Department of Geography, Cooch Behar College, Cooch Behar, West Bengal, IN
4 Department of Geography, Raja N.L.Khan Women’s College, Gope Palace, Medinipur 721102, West Bengal, IN
5 Regional Development Center, IIT, Kharagpur, IN
Source
Indian Science Cruiser, Vol 32, No 5 (2018), Pagination: 37-47Abstract
Investigation of soil properties are important for sustainable soil nutrient management. This paper presented spatial variability of soil properties at large scale based on GIS based geostatistical model. A total 27 soil samples were collected and physio-chemical analysis in laboratory using standard methods. Three geostatistical models i.e. Inverse distance weighted, radial basis functions and ordinary kriging were used to predict spatial variability of soil properties. The ordinary krigging method has provided is the lowest RMSE, indicated the higher accuracy to predict the soil properties compared to RBF and IDW methods.Keywords
Nitrogen (N), Phosphorous (P), Potassium (K), Organic Carbon (OC), Electrical Conductivity (EC), Geostatistical Modelling.References
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