International water power & dam construction, 1996
Few things in life happen under ideal conditions and that is true when designing hydraulic struct... more Few things in life happen under ideal conditions and that is true when designing hydraulic structures such as weirs or barrages. Khosla's curves have provided reliable calculation of uplift pressure, exit gradient, and key parameters when designing or rehabilitating dams on permeable foundations. These calculations are based on certain ideal conditions and the authors discuss how a numerical model measures up to real life.
Presented herein is a data parsimonious model for identification of regional and local groundwate... more Presented herein is a data parsimonious model for identification of regional and local groundwater pollution sources at a reference time employing corresponding fields of head, concentration and its time derivative. The regional source flux, assumed to be uniformly distributed, is viewed as the causative factor for the widely prevalent background concentration. The localized concentration-excesses are attributed to flux from local sources distributed around the respective centroids. The groundwater pollution is parameterized by flux from regional and local sources, and distribution parameters of the latter. These parameters are estimated by minimizing the sum of squares of differences between the observed and simulated concentration fields. The concentration field is simulated by a numerical solution of the transient solute transport equation. The equation is solved assuming the temporal derivative term to be known a priori and merging it with the sink term. This strategy circumvent...
There is rarely any study that deals with the application of vermicompost in combination with che... more There is rarely any study that deals with the application of vermicompost in combination with chemical fertiliser to study the growth and yield variables of wheat crop in the typical agro-climatic conditions of saline sandy agricultural land of tropical semi-arid climatic condition with vast fluctuations of temperature between summer and winter seasons. Hence, the current study has been planned with a broader objective of utilising the organic resources by preparing vermicompost and applying it as the partial substitute of chemical fertiliser to cultivate wheat in an eco-friendly manner in saline sandy agricultural land of the tropical semi-arid zone. For achieving the intended goal, an experiment was conducted in the field of ‘Soil-Water-Plant Laboratory’, Department of Civil Engineering, IIT Ropar, Punjab, India during the winter season (rabi) of 2018-19. In this experiment, Randomised Block Design (RBD) was followed, and four treatments were used, including T1: 100% RD using chem...
AbstractAtmospheric variables (being predictors) play a crucial role in statistical downscaling (... more AbstractAtmospheric variables (being predictors) play a crucial role in statistical downscaling (SD) studies, which subsequently are used to assess the hydrological impacts of climate change on water resources development and management. The spatial extent of these variables has an utmost importance in development of the SD model and for projecting the precipitation series. In this paper, an attempt is made to identify the spatial extent of atmospheric variables in terms of National Center for Environmental Prediction (NCEP) grid points that result in development of an efficient SD model for precipitation. A case study of the Yamuna-Hindon interbasin is considered to illustrate the applicability of the methodology proposed for capturing the effect of spatial domain of atmospheric variables on development of the SD model. The precipitation in the area is likely to be influenced by surrounding climate, topography, atmospheric circulation, thermodynamic processes, etc. Various cases of spatial extent, which ...
Pilot point methodology (PPM) permits estimation of transmissivity at unsampled pilot points by s... more Pilot point methodology (PPM) permits estimation of transmissivity at unsampled pilot points by solving the hydraulic head based inverse problem. Especially relevant to areas with sparse transmissivity data, the methodology supplements the limited field data. Presented herein is an approach for estimating parameters of PPM honoring the objectives of refinement of the transmissivity (T) interpolation and the model calibration. The parameters are the locations and number of pilot transmissivity points. The location parameter is estimated by defining a qualifying matrix Q comprising weighted sum of the hydraulic head-sensitivity and the kriging variance fields. Whereas the former component of Q promotes the model calibration, the latter one leads to improved T interpolation by locating pilot points in un-sampled tracts. Further, a three-stage methodology is proposed for an objective determination of the number of pilot points. It is based upon sequential upgradation of the Variogram as...
<p>... more <p>Present study aims at planning of agricultural groundwater development in Bist interbasin (India) that is experiencing excessive water table decline due to intense agricultural groundwater pumping. The interbasin covering an area of 8040 Km<sup>2</sup> comprises an alluvial unconfined aquifer that is hydraulically connected to two major perennial rivers viz., Satluj and Beas.  A finite difference based distributed flow model of the study area was calibrated for transmissivity geostatistically on the basis of discrete point data at 15 points, and head fields available at 6 discrete times. The deficit of transmissivity data was overcome by invoking the Pilot point approach wherein transmissivity at additional artificial points are estimated by the least squares approach. The calibrated model was oriented towards the agricultural objective by correlating its sink term with crop areas. The model was used to simulate the long-term stabilized head and the depth fields corresponding to prevailing cropping pattern. The simulation indicates large and unsustainable water table decline. The impact of various moderated cropping patterns on the water table decline was subsequently simulated. It was concluded that replacement of some fraction of area under water intensive rice crop by maize crop area may stabilize the water table depths to acceptable limit.</p>
Education theories stress not only societal context of education, but also educational philosophy... more Education theories stress not only societal context of education, but also educational philosophy, anthropology and psychology of learning. A formal curriculum theory, viz. Taba-Tyler rationale, has been proposed to incorporate philosophical, sociological, anthropological and psychological contexts of engineering education in the curriculum. The newly developed undergraduate curriculum at the Indian Institute of Technology Ropar is based on such education theories and has been presented as a case study. It has been demonstrated that the resulting curriculum can lead to unique courses that collectively bring out unique features such as core competency, strong connection to society, hands-on learning, creativity and innovation.
The genetic algorithm (GA)based simulation optimization approach is used for optimal identificat... more The genetic algorithm (GA)based simulation optimization approach is used for optimal identification of unknown groundwater pollution sources. Simple as well as complex scenarios of multiple unknown groundwater pollution sources are considered. A flow and ...
A mathematical model has been developed for arriving at an optimal conjunctive use policy incorpo... more A mathematical model has been developed for arriving at an optimal conjunctive use policy incorporating (a) spatially and temporally distributed groundwater withdrawals for a predefined pattern of surface water availability and (b) spatially distributed cropping patterns. The groundwater withdrawals are constrained by the need to keep the water table elevations over the entire area within an appropriate range. The implicit
International water power & dam construction, 1996
Few things in life happen under ideal conditions and that is true when designing hydraulic struct... more Few things in life happen under ideal conditions and that is true when designing hydraulic structures such as weirs or barrages. Khosla's curves have provided reliable calculation of uplift pressure, exit gradient, and key parameters when designing or rehabilitating dams on permeable foundations. These calculations are based on certain ideal conditions and the authors discuss how a numerical model measures up to real life.
Presented herein is a data parsimonious model for identification of regional and local groundwate... more Presented herein is a data parsimonious model for identification of regional and local groundwater pollution sources at a reference time employing corresponding fields of head, concentration and its time derivative. The regional source flux, assumed to be uniformly distributed, is viewed as the causative factor for the widely prevalent background concentration. The localized concentration-excesses are attributed to flux from local sources distributed around the respective centroids. The groundwater pollution is parameterized by flux from regional and local sources, and distribution parameters of the latter. These parameters are estimated by minimizing the sum of squares of differences between the observed and simulated concentration fields. The concentration field is simulated by a numerical solution of the transient solute transport equation. The equation is solved assuming the temporal derivative term to be known a priori and merging it with the sink term. This strategy circumvent...
There is rarely any study that deals with the application of vermicompost in combination with che... more There is rarely any study that deals with the application of vermicompost in combination with chemical fertiliser to study the growth and yield variables of wheat crop in the typical agro-climatic conditions of saline sandy agricultural land of tropical semi-arid climatic condition with vast fluctuations of temperature between summer and winter seasons. Hence, the current study has been planned with a broader objective of utilising the organic resources by preparing vermicompost and applying it as the partial substitute of chemical fertiliser to cultivate wheat in an eco-friendly manner in saline sandy agricultural land of the tropical semi-arid zone. For achieving the intended goal, an experiment was conducted in the field of ‘Soil-Water-Plant Laboratory’, Department of Civil Engineering, IIT Ropar, Punjab, India during the winter season (rabi) of 2018-19. In this experiment, Randomised Block Design (RBD) was followed, and four treatments were used, including T1: 100% RD using chem...
AbstractAtmospheric variables (being predictors) play a crucial role in statistical downscaling (... more AbstractAtmospheric variables (being predictors) play a crucial role in statistical downscaling (SD) studies, which subsequently are used to assess the hydrological impacts of climate change on water resources development and management. The spatial extent of these variables has an utmost importance in development of the SD model and for projecting the precipitation series. In this paper, an attempt is made to identify the spatial extent of atmospheric variables in terms of National Center for Environmental Prediction (NCEP) grid points that result in development of an efficient SD model for precipitation. A case study of the Yamuna-Hindon interbasin is considered to illustrate the applicability of the methodology proposed for capturing the effect of spatial domain of atmospheric variables on development of the SD model. The precipitation in the area is likely to be influenced by surrounding climate, topography, atmospheric circulation, thermodynamic processes, etc. Various cases of spatial extent, which ...
Pilot point methodology (PPM) permits estimation of transmissivity at unsampled pilot points by s... more Pilot point methodology (PPM) permits estimation of transmissivity at unsampled pilot points by solving the hydraulic head based inverse problem. Especially relevant to areas with sparse transmissivity data, the methodology supplements the limited field data. Presented herein is an approach for estimating parameters of PPM honoring the objectives of refinement of the transmissivity (T) interpolation and the model calibration. The parameters are the locations and number of pilot transmissivity points. The location parameter is estimated by defining a qualifying matrix Q comprising weighted sum of the hydraulic head-sensitivity and the kriging variance fields. Whereas the former component of Q promotes the model calibration, the latter one leads to improved T interpolation by locating pilot points in un-sampled tracts. Further, a three-stage methodology is proposed for an objective determination of the number of pilot points. It is based upon sequential upgradation of the Variogram as...
<p>... more <p>Present study aims at planning of agricultural groundwater development in Bist interbasin (India) that is experiencing excessive water table decline due to intense agricultural groundwater pumping. The interbasin covering an area of 8040 Km<sup>2</sup> comprises an alluvial unconfined aquifer that is hydraulically connected to two major perennial rivers viz., Satluj and Beas.  A finite difference based distributed flow model of the study area was calibrated for transmissivity geostatistically on the basis of discrete point data at 15 points, and head fields available at 6 discrete times. The deficit of transmissivity data was overcome by invoking the Pilot point approach wherein transmissivity at additional artificial points are estimated by the least squares approach. The calibrated model was oriented towards the agricultural objective by correlating its sink term with crop areas. The model was used to simulate the long-term stabilized head and the depth fields corresponding to prevailing cropping pattern. The simulation indicates large and unsustainable water table decline. The impact of various moderated cropping patterns on the water table decline was subsequently simulated. It was concluded that replacement of some fraction of area under water intensive rice crop by maize crop area may stabilize the water table depths to acceptable limit.</p>
Education theories stress not only societal context of education, but also educational philosophy... more Education theories stress not only societal context of education, but also educational philosophy, anthropology and psychology of learning. A formal curriculum theory, viz. Taba-Tyler rationale, has been proposed to incorporate philosophical, sociological, anthropological and psychological contexts of engineering education in the curriculum. The newly developed undergraduate curriculum at the Indian Institute of Technology Ropar is based on such education theories and has been presented as a case study. It has been demonstrated that the resulting curriculum can lead to unique courses that collectively bring out unique features such as core competency, strong connection to society, hands-on learning, creativity and innovation.
The genetic algorithm (GA)based simulation optimization approach is used for optimal identificat... more The genetic algorithm (GA)based simulation optimization approach is used for optimal identification of unknown groundwater pollution sources. Simple as well as complex scenarios of multiple unknown groundwater pollution sources are considered. A flow and ...
A mathematical model has been developed for arriving at an optimal conjunctive use policy incorpo... more A mathematical model has been developed for arriving at an optimal conjunctive use policy incorporating (a) spatially and temporally distributed groundwater withdrawals for a predefined pattern of surface water availability and (b) spatially distributed cropping patterns. The groundwater withdrawals are constrained by the need to keep the water table elevations over the entire area within an appropriate range. The implicit
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