Quaternary tectonic control on channel morphology over sedimentary low land: A case study in the Ajay-Damodar interfluve of Eastern India

AbstractThe style of active tectonic on the deformation and characterization of fluvial landscape has been investigated on three typical skrike-slip fault zones of the Ajay-Damodar Interfluve (ADI) in Eastern India through field mapping, structural analysis and examination of digital topography (ASTER-30 m), multi-spectral imageries, and Google Earth images. Channel morphology in Quaternary sediment is more deformed than Cenozoic lateritic tract and igneous rock system by the neotectonic activities. The structural and lithological controls on the river system in ADI region are reflected by distinct drainage patterns, abrupt change in flow direction, offset river channels, straight river lines, ponded river channel, marshy lands, sag ponds, palaeo-channels, alluvial fans, meander cutoffs, multi-terrace river valley, incised compressed meander, convexity of channel bed slope and knick points in longitudinal profile. Seven morphotectonic indices have been used to infer the role of neotectonic on the modification of channel morphology. A tectonic index map for the ADI region has been prepared by the integration of used morphotectonic indices, which is also calibrated by Bouguer gravity anomaly data and field investigation

Effect of land cover on channel form adjustment of headwater streams in a lateritic belt of West Bengal (India)

AbstractPresent work is exploring the influence of land cover on channel morphology in 34 headwater catchments of the lateritic belt of West Bengal. Non-parametric tests (Mann-Whitney U and Kruskal-Wallis) and multivariate analysis (Principal Component Analysis and Canonical Discriminant Function models) have successfully differentiated the performance of land cover on channel morphology adjustment among the three groups of headwater streams (forested, transitional, and agricultural) on the Kunur River Basin (KRB). Spatial Interpolation Techniques reveal that intense land-use change, particularly forest conversion to agricultural land, is significantly increasing channel widths (269%) and cross-section area (78%), whereas agricultural channels become shallower (40%) than would be predicted from forested streams. Catchments with the dominance of forest and agricultural land are classified as ‘C′ and ‘B′ types of streams respectively, as per Rosgen's Stream Classification Model. Finally, the work claimed that transitional stream group is the definitive area to exaggerate the river restoration plan to stabilize the anthropogenic deformation on channel morphology

Impact of riverbank erosion on riparian society: a micro-level study along the Ganga-Padma river in Samserganj C.D. Block of Murshidabad District, West Bengal

Th e present paper is a micro-level study aimed at analyzing the impacts of riverbank erosion on riparian society. To fulfi ll the objective, the study has been carried out from two distinctive perspectives; viz. general outlooks and specifi c inquiry. For the general outlook, the Ganga-Padma river in its lower reach downstream of Farakka Barrage in Samserganj Community Development Block has been explored in terms of channel shift ing using multi-dated satellite images. For specifi c inquiry, the eff ects of riverbank erosion on society have been studied using primary data in two selected active bank-erosion-prone cadastral units. Th e results show that recurrent bank erosion has brought a drastic change in the social fabric and caused huge losses rendering riparian inhabitants quite vulnerable, since most of the people in the study units are dependent on land-based economy and belong to poor economic groups. Th ese situations necessitate signifi cant outside assistance. However, there is a signifi cant diff erence (χ2 = 10.85 at p<0.01) in terms of assistance received during the previous year between the two selected study units

The impact of population displacement due to river bank erosion on the education of erosion victims: a study in jangipur sub-division of murshidabad district, West Bengal, India

The present research aims to find out whether population displacement due to river bank erosion has any impact on education of the erosion victims of the developing countries or not. To fulfil the objective of the study, 19 erosion affected study units were selected along the banks of the Ganga-Bhagirathi river in the Jangipur sub-division of Murshidabad district, West Bengal. Pearson’s correlation analysis and multiple linear regression analysis were performed using SPSS software. The result of the study shows that frequency of population displacement due to bank erosion and percentage of child labour are positively and significantly correlated (r = 0.51). A low mean year of schooling has been observed in almost all selected study units. The result of multiple linear regression analysis shows that river bank erosion has an adverse impact on the education of the people living along the river banks

The impact of population displacement due to river bank erosion on the education of erosion victims: a study in jangipur sub-division of murshidabad district, West Bengal, India

The present research aims to find out whether population displacement due to river bank erosion has any impact on education of the erosion victims of the developing countries or not. To fulfil the objective of the study, 19 erosion affected study units were selected along the banks of the Ganga-Bhagirathi river in the Jangipur sub-division of Murshidabad district, West Bengal. Pearson’s correlation analysis and multiple linear regression analysis were performed using SPSS software. The result of the study shows that frequency of population displacement due to bank erosion and percentage of child labour are positively and significantly correlated (r = 0.51). A low mean year of schooling has been observed in almost all selected study units. The result of multiple linear regression analysis shows that river bank erosion has an adverse impact on the education of the people living along the river banks