Faculty Publications
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Item Adapting to climate change: Water management strategy(American Society of Civil Engineers (ASCE), 2016) Goyal, M.K.; Ojha, C.S.P.; Surampalli, R.Y.; Choudhury, A.Impacts of climate change and climatic variability are evident in many parts of the world and will result in significant effects on water resources. Climate change studies inherently have to consider the significance of natural variability, future emissions, and downscaling methodology. Climate change threatens water management through changes in precipitation patterns and agricultural production through variable temperatures, and increased occurrences of extreme events, such as droughts and floods. This chapter presents a case study of Pichola Lake Basin. The objective of the case study is to assess the impact of climate change on a lake basin in an arid region in India for the various Intergovernmental Panel on Climate Change (IPCC) SRES scenarios. Adaptation and mitigation techniques are of immense importance when tackling and eliminating or reducing the adverse effects of climate change to life and property. © 2016 American Society of Civil Engineers.Item Effect of hydraulic conductivity on soil moisture uptake under saline conditions for wheat crop(2013) Devatha, C.P.; Ojha, C.S.P.; Hari Prasad, K.S.; Thalla, A.K.Salinity in soil can decrease plant available water and cause plant stress. The pattern of root water uptake for wheat was studied for saline as well as non-saline condition using non-linear root water uptake model. Experiments have been conducted using a salinity level of 4 dS/m and freshwater condition. The effect of salinity on soil moisture has been studied by varying the crop coefficient as well as hydraulic conductivity. The correction factor to the crop coefficient approach is found to be unsuccessful. However, the correction factor to the hydraulic conductivity for a non-saline condition improves the simulation of soil moisture uptake in case of saline soils. The exponential form of the equation is established for the hydraulic conductivity to soil moisture relationship under salinity level and freshwater sample. The present work also substantiates that the non-linearity parameter of root water uptake model (O-R model) is successful in simulation of soil moisture depletion in the crop root zone and does not vary more than 10% in case of saline soils. © 2013 Indian Society for Hydraulics.Item Assessment of soil moisture uptake under different salinity levels for paddy crop(American Society of Civil Engineers (ASCE) onlinejls@asce.org, 2016) Devatha, C.P.; Shankar, V.; Ojha, C.S.P.The core of salinity problems starts from the fact that irrigation waters contain some amount of dissolved salts. Soil moisture salinity is dependent on soil type, climate, water use, and irrigation. The root water-uptake pattern for paddies is studied for saline as well as nonsaline conditions in the present study using a nonlinear root water uptake model. Field crop experiments are carried out using irrigation water with two different levels of salinity (4 and 6.25 dS=m) and fresh water. The effect of salinity on soil moisture uptake is studied by two approaches, i.e., effect on crop coefficient and effect on hydraulic conductivity. Based upon the experimental observations for lowsaline (4 dS=m), high-saline (6.25 dS=m), and freshwater conditions, an exponential form of an equation is established for the hydraulic conductivity. The results obtained for soil moisture depletion in the crop root zone show significant improvement in prediction of soil moisture uptake for saline cases with the use of the obtained nonlinearity parameter. © 2016 American Society of Civil Engineers.