Informatics Publishing Limited

M. S. Rawat ¹, D. P. Uniyal ¹, R. Dobhal ¹, Varun Joshi ², B. S. Rawat ³, Anil Bartwal ⁴, Devendra Singh ⁵, Ashok Aswal ⁵

Affiliations
1 Uttarakhand State Council for Science & Technology, Vigyan Dham Jhara, Dehradun 248 007, IN
2 Guru Govind Singh Indra Prastha University, Sector 16C, Dwaraka, New Delhi 110 078, IN
3 Dayanand Brijendra Swarup (PG) College, Dehradun 248 001, IN
4 Mandakini Hydropower Project, Phata 246 471, IN
5 Uttarakhand Space Application Centre, Vasant Vihar, Phase II, Dehradun 248 006, IN

Abstract

The Mandakini Valley of Rudraprayag district, Uttarakhand witnessed unprecedented damage to life, property, infrastructure and landscape on 16 and 17 June 2013 due to torrential rains. Run-off discharge data indicate that antecedent rainfall exceeded the limit and the overflow of rivers led to landslide in the region and flash floods in the downstream areas. Fragile geology of the area, close to Main Central Thrust (MCT), degradation processes and torrential rains are responsible for triggering landslides and flash floods. A landslide inventory was carried out in the affected areas based on pre- and post-flood high resolution satellite data (LISS-IV and Cartosat-2). A total of 290 landslides were identified from pre-flood satellite LISS IV (2011) imagery and 1665 were identified in post-flood satellite imagery along major rivers. Using remote sensing and geographic information system techniques, thematic layers were generated. Using the weightage rating system, a landslide hazard zonation map of the area was prepared. Each class within a thematic layer was assigned an ordinal rating from 1 to 9. Summation of these attribute values was then multiplied by the corresponding weights to yield different zones of landslide hazard. A landslide hazard zonation map having five different zones ranging from very low hazard zone to very high hazard zone was prepared with the objective to create a reliable database for post-disaster management and for planning developmental activities in the district.

Keywords

Flash Floods, Landslide Hazard Zonation, Satellite Data, Thematic Layers.

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Varun Joshi ¹

Affiliations
1 G.B. Pant Institute of Himalayan, Environment and Development, Garhwal Unit, Post Box 92, Srinagar (Garhwal) - 246 174, Uttaranchal, IN

Abstract

No Abstract.

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Ajay K. Naithani ¹, Varun Joshi ², C. Prasad ²

Affiliations
1 Department of Geology, Post Box. No. 86, H.N.B. Garhwal University, Srinagar (Garhwal) 246 174, IN
2 GBP Institute of Himalayan Environment and Development, Garhwal Unit, Srinagar (Garhwal) 246 174, IN

Abstract

The catastrophic landslides of Gona village, which took place on 31 August 2001, has been subjected to field investigation. Our study indicates that a combination of several factors are responsible for this tragedy, but the action of water during the cloudburst was the main triggering factor.

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Geeta Arora ¹, Varun Joshi ¹

Affiliations
1 Department of Mathematics, Lovely Professional University, Punjab − 144411, IN

Abstract

Objectives: This paper aims to compute the approximate solution of one dimensional (1D) hyperbolic telegraph equation with appropriate primary and limiting conditions. Methods/Statistical Analysis: To find the approximate solution, two different modified spline basis function are used with the differential quadrature method and splines are used to compute the weighting coefficients and thus the equation is transformed to a set of first order conventional differential equations which is further solved by the SSP-RK43 method. Three test problems of this equation are simulated to establish the precision and usefulness of the proposed scheme. Findings: The obtained numerical results are found to be good in terms of accuracy, efficiency and simplicity. To validate the computed results using proposed scheme, various comparisons at different time levels has been done in the form of and errors. These errors are compared and enlisted in the form of tables with computed errors enlisted in literature. Application/Improvements: Being an important equation of nuclear material science, one dimensional (1D) hyperbolic telegraphs equation needs to take care in the sense of better numerical solution. In this context, a successful effort has been done in this research article by proposing a hybrid numerical scheme.

Keywords

35K57, Differential Quadrature Method, Hyperbolic Telegraphs Equation, Mathematics Subject Classification (2010): 65M06, Modified Cubic B-Spline, Modified Trigonometric B-Spline, SSP-RK43.

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