Papers by P V Timbadiya (Associate Professor, CED) SVNIT
Fine Resolution Precipitation Projection for Tapi River Basin
Optimal Cropping Pattern in Command Area of Kakrapar Right Bank Main Canal
The management of available irrigation water resources is the best technique to get optimal crop ... more The management of available irrigation water resources is the best technique to get optimal crop yield for a given cropping pattern in the command area. The present study is aimed to get the optimal allocation of irrigation water depending upon the availability of water from the source. The net revenue from agricultural production will be maximized for available irrigation water with the sets of constraints like crop area, cropping pattern, continuity equation, minimum and maximum storage, canal capacity, water requirement of crops etc. Linear programming model has been developed to obtain the optimal cropping pattern for command area of Kakrapar weir right bank main canal which is a part of Ukai Irrigation Project, Gujarat.
Analysis of trends and variability in time series of extreme daily rainfall in Tapi basin, India
Review of Downscaling Methods in Climate Change and Their Role in Hydrological Studies
Recent perceived climate variability raises concerns with unprecedented hydrological phenomena an... more Recent perceived climate variability raises concerns with unprecedented hydrological phenomena and extremes. Distribution and circulation of the waters of the Earth become increasingly difficult to determine because of additional uncertainty related to anthropogenic emissions. The world wide observed changes in the large-scale hydrological cycle have been related to an increase in the observed temperature over several decades. Although the effect of change in climate on hydrology provides a general picture of possible hydrological global change, new tools and frameworks for modelling hydrological series with nonstationary characteristics at finer scales, are required for assessing climate change impacts. Of the downscaling techniques, dynamic downscaling is usually based on the use of Regional Climate Models (RCMs), which generate finer resolution output based on atmospheric physics over a region using General Circulation Model (GCM) fields as boundary conditions. However, RCMs are ...
One-dimensional hydrodynamic modelling of flooding and stage hydrographs in the lower Tapi River in India
Current science
The present st udy addresses t he simulation of f loods for t he years 2003 and 2006 and t he dev... more The present st udy addresses t he simulation of f loods for t he years 2003 and 2006 and t he developme nt of stage–discharge relationship along t he lowe r Tapi River in India. The river network and cross-sections, for t he present st udy, were ext racte d f rom t he f ield- surveyed contours of t he Tapi River. Using t he afore- said geomet ry and hydrological data, supplie d by t he stakeholders, t he MIKE 11 hydrodynamic model was calibrate d for t he 1998 f lood using releases from t he Ukai Dam (f lood hydrograph) and t he tidal water level in t he Arabian Sea as t he upst ream and down- stream boundary conditions respectively. The cali brated mode l was validate d using low- and high-f lood data of t he years 2003 and 2006 respectively. The time series of t he simulate d f lood levels we re compare d wit h t he corresponding observe d values at four inte r- me diate gauging stat ions: Kakrapar We ir, Mandavi Bridge, Ghala village and t he Surat cit y ( Nehru Bridge). The mode...
Investigation of Long-Term Trends and Temporal Variability of Rainfall in Surat District, Gujarat
The rainfall is a principal component of hydrologic cycle, and its variability is having vital im... more The rainfall is a principal component of hydrologic cycle, and its variability is having vital importance for both scientific as well as socio-economic considerations. In present study, the temporal variability of precipitation has been investigated in Surat district, Gujarat, India for the period of 110 years (1901 – 2010) on annual basis. The overall variability in the rainfall has been quantified by using rainfall variability index. Further, the monotonic trends in the rainfall are detected by non-parametric Mann-Kendall (MK) test, and their change in magnitude with time are reported using Sen’s slope estimator and linear regression tests. Moreover, innovative trend analysis (Sen’s 1:1 trend line method) has also been applied, and the results are found to be in agreement with MK and Sen’s slope estimator tests. The study has revealed a positive trend across the Surat district. Also, the magnitude of upward trend has been found to be very significant. The increasing trend in the p...
Monthly Inflow Trend Analysis of Ukai Reservoir Using an Innovative Methodology
Inflows into the reservoir are one of the key elements for the decision makers for effective rese... more Inflows into the reservoir are one of the key elements for the decision makers for effective reservoir operation. Prediction of extreme events like droughts and floods can be accomplished by thorough inflow analysis. Reservoir inflow influences the action of planning, operation and management of any water resources system. The most commonly used trend analysis techniques for inflow into the reservoir are non-parametric statistical tests such as Mann-Kendall (MK), Spearman's Rho (SR). Strength of such tests depend upon pre-assigned significance level, magnitude of trend, sample size and the amount of variation in the time series data. In the present study, an innovative trend analysis methodology developed by Şen (2012) which is independent of all aforesaid factors, has been utilized to detect inflow trend into Ukai reservoir on the Tapi River. Collection of monthly inflow, trend analysis methodology, scatter plot on Cartesian coordinate system and result of the study is presente...
Reliability of APHRODITE Reanalysis used in Climate studies for Tapi basin
Application of Linear Programming for Optimal Operation at Ukai Reservoir
A 1D–2D Coupled Hydrodynamic Model for River Flood Prediction in a Coastal Urban Floodplain
Journal of Hydrologic Engineering, 2015
ABSTRACT In this work, a one dimensional–two dimensional (1D–2D) coupled hydrodynamic model is de... more ABSTRACT In this work, a one dimensional–two dimensional (1D–2D) coupled hydrodynamic model is developed for prediction of water levels in the lower Tapi River and its coastal urban floodplain (Surat city in Gujarat, India). A one-dimensional (1D) hydrodynamic model, calibrated for the 1998 flood, is coupled with a two-dimensional (2D) hydrodynamic model of an urban floodplain with due consideration of the upstream (releases from Ukai reservoir) and downstream (tidal level of the sea) boundary conditions. The resistance coefficient for the floodplain is estimated using satellite imagery based on the land use and land cover pattern. The coupled hydrodynamic model is validated with independent data for flooding in the year 2006 and is used to develop a stage-discharge curve along the lower Tapi River for computation of the stream power during the flood. The methodology for river flood prediction on a coastal urban floodplain using the 1D–2D coupled hydrodynamic model is generic and can be applied to similar geographical conditions.
Identification of trend and probability distribution for time series of annual peak flow in Tapi Basin, India
ISH Journal of Hydraulic Engineering, 2013
ABSTRACT This study deals with trend analysis of observed annual peak flow time series data at fo... more ABSTRACT This study deals with trend analysis of observed annual peak flow time series data at four stream gauging stations in the Tapi Basin. Innovative trend analysis, recently proposed by Şen, and Mann Kendall test are used to ascertain the trend in extreme annual flow (flood) at aforesaid gauging stations in the Tapi Basin. Also, the time series of extreme flow data have been checked for their serial correlation and, subsequently, flood frequency analysis is undertaken to obtain floods of different return periods. The fitted probability distributions are also used to predict extreme flow into the Ukai Reservoir on the basis of information from upstream gauging stations. The methodology has also been used to predict runoff into the reservoir from the unguaged catchments.
Hec-Ras Based Hydrodynamic Model in Prediction of Stages of Lower Tapi River
ISH Journal of Hydraulic Engineering, 2011
Hydrodynamic model of the lower Tapi river from Ukai dam to Surat city has been developed using w... more Hydrodynamic model of the lower Tapi river from Ukai dam to Surat city has been developed using well known unsteady open channel flow code HEC-RAS using field surveyed geometric data of the stream with appropriate upstream and downstream boundary conditions. The flood flows of years 1998, 2003 and 2006 have been simulated in the said model. The observed and simulated
Journal of Water Resource and Protection, 2011
Channel roughness is a sensitive parameter in development of hydraulic model for flood forecastin... more Channel roughness is a sensitive parameter in development of hydraulic model for flood forecasting and flood inundation mapping. The requirement of multiple channel roughness coefficient Mannnig's 'n' values along the river has been spelled out through simulation of floods, using HEC-RAS, for years 1998 and 2003, supported with the photographs of river reaches collected during the field visit of the lower Tapi River. The calibrated model, in terms of channel roughness, has been used to simulate the flood for year 2006 in the river. The performance of the calibrated HEC-RAS based model has been accessed by capturing the flood peaks of observed and simulated floods; and computation of root mean squared error (RMSE) for the intermediated gauging stations on the lower Tapi River.
Optimization Of Irrigation Area of Ukai Right Bank Main Canal-A Linear Programming Approach
This paper presents a Linear Programming (LP) model for obtaining optimized cropping area in the ... more This paper presents a Linear Programming (LP) model for obtaining optimized cropping area in the command of Ukai reservoir. The objective is to maximize the sum of the relative yields from all crops in the irrigated area for specific range of water availability like 100%, 90%, 80% and 70%. The present study is aimed to get the optimal allocation of irrigation water depending upon the availability of water from the source. The net revenue from agricultural production will be maximized for available irrigation water taking into account the sets of constraints like crop area, cropping pattern and water requirement. The model is applied to a part of Ukai reservoir system namely Ukai Right Bank Main Canal (URBMC), in Gujarat state, India.
Conference Presentations by P V Timbadiya (Associate Professor, CED) SVNIT
The sewerage network is designed to adequately collect and transfer the sewage to treatment plant... more The sewerage network is designed to adequately collect and transfer the sewage to treatment plant safely. Its performance at peak flow assures its adequacy in terms of size, slope and minimum velocity. The conventional and non-conventional sewer network are designed for 30 and 15 year respectively as per future development. The Sardar Vallabhbhai National Institute of Technology, Surat (SVNIT-Surat) has the sewerage network since its inception and redesign as non-conventional network in year 2001. It is important to check its present performance and its capacity to withstand against future development. In the present study, the whole existing sewerage network of 4.79 km with RCC circular pipe of 300 mm diameter is re-surveyed. The levels of all lines and manholes are collected. The sewerage load for whole network was calculated from the water supply of the institute. The total water supply for the connected buildings of the institute in the existing network is 0.664 MLD. The model has been developed for existing network using Bentley SewerGEMS V8i. The existing loading is simulated using developed model and total average and peak sewage flow at outfall of the network is 0.551 MLD and 1.67 MLD respectively. It is found that the minimum velocity, i.e. ≥ 0.6 m/s as per CPHEEO (Central Public Health & Environment Engineering Organization) manual, 2012, is not met throughout total length of the said network. The network may perform well when all the academic buildings, new staff quarters (under construction) and other buildings get connected to the network in future. The study presented is generic in nature and can be applied to town/city level to check/improve the performance of sewerage network from time to time.
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Papers by P V Timbadiya (Associate Professor, CED) SVNIT
Conference Presentations by P V Timbadiya (Associate Professor, CED) SVNIT