<p>Shiv Nadar University is a comprehensive, multidisciplinary, research-focused, and student-centric University offering a full range of academic programs at the undergraduate, postgraduate and doctoral level. With state-of-the-art infrastructure, the University comprises of academic wings, sophisticated labs, international standard sports facilities, amphitheaters, auditorium, conference rooms and smart classrooms. The University&rsquo;s goal is to become internationally recognized for the quality of its research and creative endeavors and their applicability to improving quality of life, generating new insights and expanding the boundaries of human knowledge creativity. Committed to excellence in teaching, research and service, the University aims to serve the higher education needs of India and the world beyond.</p>

Shiv Nadar University

The strongest circulation gives the maximum effects of submerged vanes at optimal angle of attack and at the same time local scour holes develop around the submerged vanes, which may dislodge the submerged vanes. With the introduction of collar or riprap with geo-filter at the leading edge of submerged vane, the local scour may be reduced. A comparison of the cost of riprap with geo-filter and collar has been attempted to get a general idea of economics. This paper explains theoretically how to compare the cost of riprap with geo-filter and collar.

World University root node

Center for Environmental Sciences & Engineering

Water and Energy International

Economic analysis: Riprap with geo-filter vs collar as scour protections around submerged vanes

For spacing of vane arrays, the information about strength of vortex downstream of a submerged vane is needed. A series of experiments were performed with rectangular submerged vane with and without a collar at Froude numbers 0.13 and 0.25. To define the strength of vortex, a new set of dimensionless parameters using moment of momentum are involved. The present study provides certain information on the decay of strength of vortex with downstream of vane. The decay of vane strength does not follow similar trend and appears sensitive to the location of center of vortex, Froude number, etc. The streamwise spacing of submerged vanes may be taken at least 40H at optimal angle of attack. Centre of vortex is also observed to change with the downstream of submerged vane. © 2006 Taylor & Francis Group, LLC.

ISH Journal of Hydraulic Engineering

Decay of strength of vortex down stream of submerged vane

The study attempts to undertake a comparison of methods of analysis for raft foundation of a barrage especially involving two methods, viz., Hetenyi's beams on elastic foundation method and Finite Element Method (FEM). In the analysis of barrage raft, moments at different discrete points along the raft of barrage have been calculated by Hetenyi's method and FEM, and their comparison has been made for typical representative cases only considering flow and no flow conditions incorporating earthquake loads as pseudo-static loads. Significant differences have been observed in the moments as obtained by the two methods. The end of the barrage raft where pier is located, the Hetenyi's method gives positive moments while FEM has yielded negative moments. It has also been observed from the results that Hetenyi's method of analysis may not be always on conservative side in comparison to FEM. The comparative analyses indicate that the IS 11130-1984 recommendation regarding Hetenyi's method (Beams on elastic foundation) merits further in vestigation.

Comparative study on analysis of barrage raft by Hetenyi's method and FEM

Majuli, the world's largest river island, is situated to the north of Jorhat in India and at the confluence of the Subansiri and Brahmaputra rivers. Flooding ravages the population of 0.13 million every year, robbing them of the basic requirements of life. This island, which was over 1245 km2 in the 1950s, was reduced to 376.93 km2 in 2002 due to continuous erosion of banks by the Brahmaputra river, wiping out scores of villages and displacing thousands of people. The heritage of the people of Majuli, the civilization they have nurtured for the last five centuries, is about to be buried. Burial of this civilization will be a loss to the whole of humanity. Therefore, a global approach to this problem of flooding and subsequent erosion has become inevitable, and is urgently needed to save the world's largest river island as well as its glowing cultural heritage. This paper focuses on the study of erosion problems of the decaying island, deploying remote sensing and an artificial neural network (ANN) technique. © 2005 Taylor &amp; Francis Group, LLC.

International Journal of Remote Sensing

Use of remote sensing and ANN in assessment of erosion activities in Majuli, the world's largest river island

Recent advances in technology have permitted the construction of large high dams and large storage reservoirs. These advances have necessitated the development of new design and construction techniques, particularly pertaining to provision of adequate flood release facilities. Chutes and spill-ways are designed to spill large water discharge over a hydraulic structure without causing major damage to the structure itself and its environment.

International Water Power and Dam Construction

Part of the design

At optimal angle of attack, occurrence of destabilizing local scour phenomenon especially around the leading edge of the vane is formed and at this angle vane induced secondary circulation is also maximum. The maximum scour depth around the vane mainly depends on flow depth and flow Froude number. Flow Froude number is more important than Densimetric Froude number. This will presuppose checking the magnitude of local scour around the submerged vanes by a suitable local scour retarder method. © 2005 Taylor & Francis Group, LLC.

Modelling of local scour around rectangular submerged vane

In part 1 of this article, the authors explored the different uses and design aspects of stepped spillways, including energy dissipation, aeration and gas abutment and determination of point of intecption. In this second part, design methodology and design approaches are reviewed.

River Brahmaputra is well-known for changing its course from time to time due to the erosion process and consequently wiping out agricultural lands and sometimes complete villages in its path causing immense damage. A study of the bank-line migration based on remote sensing data can play a very useful role in monitoring migration trends and characteristics, and can fruitfully supplement conventional surveying, which is otherwise very tedious, slow and time intensive. Application of ANN technique in conjunction with remote sensing data enables a rational assessment of the process of morphological change with regard to bank-line migration. This enables a better appreciation of the river bank-line migration both in time and space for palliative and preventive measures. © 2004 Taylor & Francis Group, LLC.

Ann model development for bank-line migration of river brahmaputra using remote sensing data

The morphology of highly braided large alluvial stream like the Brahmaputra river is fraught with great deal of complexities. Due to the inherent intricacies involved, conventional approach for morphological modelling for a river like the Brahmaputra will not be suitable due to intricate relationships between the channel geometrical variables. In this study, an attempt has been made to apply the Artificial Neural Network (ANN) technique, to develop ANN model of Brahmaputra river to predict cross-section profile and top width. The interpolated and extrapolated cross-section profile in the past, present and future with respect to time as predicted by ANN models are found to be encouraging which merits more further study.