Central Water and Power Research Station

Pune, India

Central Water and Power Research Station

Pune, India
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Balan S.,Central Water and Power Research Station
Advances in Intelligent Systems and Computing | Year: 2017

The collection of bathymetry data remotely and its analysis is a challenging task due to the complexity of the data acquisition devices like echo sounders and the large amount of data. The data obtained is also affected by noise and needs to be processed to predict the bottom surface of the water body. This paper presents a novel approach for analysis of bathymetry data of a reservoir. The proposed system involves multipath noise removal and interpolation of the data to find the volume of water in the reservoir. The Wavelet packet decomposition technique is used for removing noise in the data. Further, nearest neighborhood and TIN interpolation techniques are used to obtain a 3D model of the reservoir. This approach is used to calculate the volume of water in the reservoir. © Springer Science+Business Media Singapore 2017.


Vivekanandan N.,Central Water and Power Research Station
International Journal of Management Science and Engineering Management | Year: 2013

Rainfall intensities of various frequencies and durations are important parameters for the hydrologic design of storm sewers, culverts and other hydraulic structures. This can be achieved by the rainfall Intensity–Duration–Frequency (IDF) relationship, which is determined through rainfall frequency analysis. This paper exemplifies the use of the Gumbel and Fréchet distributions for modeling annual n-hourly maximum rainfall over different durations ‘n’ such as 1, 2, 3, 6, 12, 18, 24, 48, and 72h (hr) recorded at Kanyakumari and Mandla rain-gauge stations. The order statistics approach is applied for the determination of distributional parameters in order to estimate rainfall and develop IDF relationships for different return periods. Goodness-of-Fit (GoF) tests such as the Anderson–Darling and Kolmogorov–Smirnov tests are employed for checking the adequacy of fitting the distributions to the recorded data. A diagnostic test involving the D-index is applied in order to select whether the Gumbel or the Fréchet is the most suitable distribution for the rainfall estimation. Model Performance Indicators (MPIs) such as the root mean square error and the correlation coefficient are used to analyse the performance of IDF relationships given by the Gumbel and Fréchet distributions. Based on the GoF and diagnostic test results, and MPI values, the study suggests that the IDF relationships developed using the Gumbel distribution are better suited for the estimation of rainfall intensity for Kanyakumari and Mandla. © 2013 International Society of Management Science and Engineering Management.


Vivekanandan N.,Central Water and Power Research Station
International Journal of Management Science and Engineering Management | Year: 2013

The estimation of extreme rainfall for a desired return period is of utmost importance for planning, design and management of hydraulic and other structures in a region. This paper presents the methodology adopted in rainfall estimation for Hissar and Kalingapatnam regions using six parameter estimation methods of Gumbel distribution. The Kolmogorov–Smirnov (KS) statistic is used for checking the adequacy of fitting of the method for determination of estimators of the distribution. Diagnostic tests involving D-index and root mean square error are used for the selection of a suitable method for estimation of rainfall. The paper demonstrates that the method of least squares (MLS) is better suited for modelling annual maximum rainfall for Hissar and probability weighted moments (PWM) for Kalingapatnam. The KS test results and diagnostic analysis show that the 1000 year return period extreme rainfalls given by MLS and PWM may be adopted for design purposes in the Hissar and Kalingapatnam regions respectively. © 2013 International Society of Management Science and Engineering Management.


Shaligram V.M.,Central Water and Power Research Station
ISH Journal of Hydraulic Engineering | Year: 2011

Over the past few decades mathematical modeling technique is in vogue. A large number of water hammer cases have been analyzed using this technique, not only for simple systems but also for those with rather complex situations. The present analysis for a water conductor system having intermediate boundary condition such as pump behavior needed a hybrid mathematical model. The results of analyzing such system and comparing them with those obtained from the hydraulic scale model give more confidence in adoption of the mathematical technique. © 2011 Taylor & Francis Group, LLC.


Vivekanandan N.,Central Water and Power Research Station
Mausam | Year: 2011

Prediction of runoff is often important for optimal design of water storage and drainage works and management of extreme events like floods and droughts. Rainfall-runoff (RR) models are considered to be most effective and expedient tool for runoff prediction. Number of models like stochastic, conceptual, deterministic, black-box, etc. is commonly available for RR modelling. This paper details a study involving the use of Artificial Neural Network (ANN) and Regression (REG) approaches for prediction of runoff for Betwa and Chambal regions. Model performance indicators such as model efficiency, correlation coefficient, root mean square error and root mean absolute error are used to evaluate the performance of ANN and REG for runoff prediction. Statistical parameters are employed to find the accuracy in prediction by ANN and REG for the data under study. The paper presents that ANN approach is found to be suitable for prediction of runoff for Betwa and Chambal regions.


Bhowmick S.,Central Water and Power Research Station
Geotechnical and Geological Engineering | Year: 2016

Vp/Vs and Poisson’s ratio (σ) of subsurface strata are important parameters in the foundation study for the assessment of lithology, quality and strength of the rock, structural disturbances and saturation condition prior to the construction of huge civil structure like Nuclear Power Plant. The present work in this paper, showing the evaluation of overburden thickness, assessing quality and compactness of rock and identifying structural disturbance using Vp/Vs and Poisson’s ratio, is based on the fact that Vp/Vs is a better indicator of lithology (Mokhtar et al. in Porosity and heterogeneity effect on Vp/Vs ratio in carbonate rocks from a reservoir in the Middle East, Milan, 2012) than individual velocity values i.e. Vp and Vs. Moreover Vp/Vs and Poisson’s ratio both indicate the quality of rock (Bahremandi et al. in J Sci Res Rev 12:015–019, 2012) and structural disturbances within rock in terms of cracks, fractures or joints (Barton in Rock quality, seismic velocity, attenuation, and anisotropy, Taylor & Francis, London, 2006) etc., which is helpful in deciding the load bearing capacity of the foundation. The value of Vp and Vs, used in this paper, are taken from four research papers where Vp and Vs as a function of depth are studied with examples of Kalpakkam Nuclear Power Project, Tamilnadu (Boominathan in Curr Sci 87(10):1388–1397, 2004), Kakrapar Atomic Power Plant, Gujarat (Wadhwa et al. in J Ind Geophys Union 13(1):9–16, 2009), Kaiga Atomic Power Plant, Karnataka (Wadhwa et al. in J Ind Geophys Union 14(1):21–30, 2010) and Tarapur Atomic Power Plant, Maharashtra (Wadhwa et al. in J Ind Geophys Union 9(2):137–146, 2005) in Indian subcontinent. © 2016 Springer International Publishing Switzerland


Gupta I.D.,Central Water and Power Research Station
Natural Hazards | Year: 2013

The use of recent ground motion prediction equations in probabilistic seismic hazard analysis (PSHA) with area type of seismic sources requires defining the probability distributions of various source-to-site distance metrics with finite fault rupture taken into account. This task is rendered very difficult due to large epistemic uncertainties involved in specifying the details of the causative faults for area sources of diffused seismicity. However, it may generally be possible to constrain the strike and dip angles for fault ruptures in area sources from regional seismotectonic and geological information. This paper proposes to estimate the various finite fault distance measures from a site to a location in an area source by averaging the distances for several fault rupture scenarios with randomly distributed strike and dip over specified ranges. To consider the spatial distribution of the seismicity, the paper then provides the guidelines for defining the distance distributions by assigning suitable weight factors to the distance estimates for a grid of locations in the source area. The PSHA computation based on the distance distributions thus defined is shown to provide quite realistic and objective estimate of the hazard. © 2012 Springer Science+Business Media Dordrecht.


Andrade R.,Central Water and Power Research Station
International Journal of Geophysics | Year: 2014

In hard rock terrain, fractured aquifers comprise the major source of groundwater availability where the phreatic aquifer is desaturated. Identification of fracture zones in hard rock terrain and potential groundwater source delineation had been a perennial problem in hydrology. The purpose of this paper is to highlight the study over a small watershed area, in a granite terrain, wherein an attempt was made to delineate and map the fractured aquifer using numerical (factor) analysis of the conventional vertical electrical sounding data, which was obscure in curve matching technique. This numerical approach in concatenation with resistivity imaging or other techniques would prove to be an effective tool in groundwater exploration. © 2014 Rolland Andrade.


Gupta I.D.,Central Water and Power Research Station
Soil Dynamics and Earthquake Engineering | Year: 2010

From an analysis of a limited number of strong-motion data recorded in northeast Indian region, the in-slab earthquakes along the Indo-Burmese subduction zone are found to be characterized by much larger ground motion amplitudes than that for the earthquakes along other subduction zones around the world. Specific type of source, propagation path and site geologic condition may perhaps simultaneously be responsible for such anomalous behaviour. The empirical attenuation relations developed by Atkinson and Boore [3] using a global database for subduction zone earthquakes have been therefore suitably modified to be more appropriate for the northeast India. The modified relationships are developed by combining the data for both horizontal and vertical components of motion. The response spectra of the accelerograms recorded in northeast India from earthquakes with widely varying magnitude and distance are, in general, found to match very well with the predictions from the modified attenuation model. The proposed model can thus be used to obtain more realistic estimate of the contribution of in-slab subduction zone earthquakes to seismic hazard in the northeast Indian region. © 2010 Elsevier Ltd. All rights reserved.


Kudale M.D.,Central Water and Power Research Station
Indian Journal of Marine Sciences | Year: 2010

Coastal areas are varied in physical features. The coastline shows constantly varying nature due to tidal effects and seasonal changes in wave and wind climate. Occasional cyclones in the region also have influence on the overall morphology. It is necessary to understand the coastal processes and predict likely effects before undertaking any coastal project. Developments of major/minor ports and fishery harbours consist of the construction of coastal structures like breakwaters, jetties, groynes and reclamation bunds. Developments of the ports also involve the dredging and disposal activities to maintain the required depths for navigation. These coastal structures and the dredging activities interfere in the coastal processes of the region. Modifications in the coastal processes have large impact on the coastline. Major morphological impact is felt in the coastal region having high rate of longshore littoral drift. Accumulation of sediments on the updrift side and erosion of the downdrift side is inevitable in these regions. Sand bypassing is one of the best solutions to mitigate this problem. Sand bypassing should form an integral part of any port development project at the planning stage.

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