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An International Year of Planet Earth-2008 Initiative

Current Issue Technical

Year 2017

Volume X

7-4-2017
Sustainable River Basin Management Planning: A Holistic Approach
Sonali Swetapadma and C.S.P. Ojha
Abstract

 

Water is the most vital element to life on earth, which can be a limited resource in an expanding global economy and population. The river water, a major source of surface water, finds multiple uses in irrigation, navigation, hydropower generation, flood management etc., thereby increasing the degree of complexity regarding its distribution among the users. The planning and management of river basin have gradually evolved over time with the change in water demand and also the river condition. Since last few decades, it has started moving towards a more scientific and technical approach consisting of integrated practices and management. India, being the second most populous nation of the world, its limited water resources is increasingly constrained by growing demand for irrigation and industrialization, which in turn has raised the level of pollution in many holly rivers along with interstate water disputes. To deal with all these conflicts, the river basin planning requires a sustainable holistic modeling of the entire basin for the socio-economic development of the country. This paper recounts the evolution of river basin planning stages with a special focus on holistic modeling along with some major issues rising in the water stressed-country like India.

 

Keywords: River basin; interstate water disputes; holistic modelling; socio-economic.

8-4-2017
Rainfall-Induced Landslide Hazard Assessment along NH 1D from Ganiwan to Gumri (J & K), India
Aadil Manzoor Nanda, Pervez Ahmed* and T. A. Kanth
Abstract

The aim of this study is to generate reliable susceptibility maps using weights of rainfall events and landslide occurrence models based on (land-area-based/location) using geographic information system (GIS) and remote sensing for the NH 1D from Ganiwan to Gumri, Jammu, and Kashmir. At first, landslide locations were identified by earlier available reports, aerial photographs, and field surveys and a total of 221 landslides were mapped from Ganiwan to Gumri along NH 1D since 1992-2011 from different sources. The present study reveals that 114 landslide events were found to have a significant correlation with rainfall occurrence and remaining landslide episodes seem to have occurred due to lithology and slope factor. The landslides were categorized into five categories on the basis of the frequency of occurrence over a period of time from 1992 to 2011.The results of the statistical analysis with the general linear regression model showed that the maximum landslide occurrence is explained by rainfall increase except at ascertain point of time where landslide occurrence seems to be related to other factors as well.

 

Keywords: Landslide, Rainfall, Causative Factors, J&K, NH 1D
9-4-2017
Numerical Study of Effect of Ridge-Weathering Thickness Effect on the Ground Motion Amplification
Vinay Kumar, J.P. Narayan and Manoj Kumar
Abstract

 

This paper presents the effects of ridge-weathering thickness on the ground motion amplification pattern. Seismic responses of the considered weathered ridge models have been computed using a 2D fourth-order-accurate staggered-grid finite-difference (FD) algorithm for the SH-wave and P-SV wave simulation in viscoelastic medium. The incorporation of realistic damping in the time-domain FD simulation is based on the GMB-EK rheological model. The analysis of the simulated responses of the weathered ridge models revealed considerable effects of weathering thickness on the ground motion characteristics. The obtained peak spectral amplification was of the order of 4.0 with respect to a response of a weathered horizontal layer overlying the rock. The computed average spectral amplification (ASA) for the SH-wave and P-SV wave in the high and low frequency ranges revealed that in the high frequency range, the ASA is decreasing with an increase of weathering thickness. On the other hand in the low frequency range, the ASA is increasing with an increase of weathering thickness. Further, ASA is highly affected by the spectral peaks associated with the resonances in the weathered layer. Analysis of these results illustrates the importance of consideration of ride-weathering thickness effect on ground motion during seismic hazard assessment.

 

Keywords: Finite difference simulation, ridge-weathering effects, local site effects.