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Doctorat
Inde
2017
Hydrological modelling and degraded land evaluation of a tank cascaded semi arid catchment for bioenergy crop production
Titre : Hydrological modelling and degraded land evaluation of a tank cascaded semi arid catchment for bioenergy crop production
Auteur : Rajeswari A,
Université de soutenance : Anna University
Grade : Doctor of Philosophy (PhD) 2017
Résumé
The growing population, urbanization and industrialization result in
increased demand for food, water and energy which in turn cause pressure on
land, water and energy resources. In order to meet out the demand without
stressing on the resources, an integrated approach of land, water and energy
nexus has to be made through sustainable resources management. The
primary aim of this study is to determine the tank cascaded catchment’s water
resource potential and to evaluate the degraded land for crop production,
which are the more prevalent issues in the semi-arid regions of South Asia.
These issues have to be resolved so that effective planning and management
of water and land resources can be made. These can be obtained through
simulation of surface and groundwater dynamics in the tank cascaded
catchment using physically based deterministic modelling and evaluation of
the degraded land for restoring under cultivation with the integrated
production of food, fodder and bioenergy. Sindapalli Uppodai a semi-arid
tank cascaded sub-basin of Vaippar basin in South Tamil Nadu of India
consisting of sixteen tanks linked in the form of cascade has been taken for
the study.
Hydrology of a tank cascaded basins in the semi-arid region is unique and different from a catchment without any intervening surface storage structures. Earlier the effects of tanks were being lumped while modelling as it requires extensive data. An attempt has been made in this study to characterize and to simulate the flow process through a tank cascaded system with the application of coupled MIKE SHE and MIKE 11, a fully integrated physically based deterministic and distributed model. With the help of primary and secondary data, the complex integrated model has been set up by coupling MIKE SHE and MIKE 11 model. The semi-arid region’s tank cascaded features and processes of the surface tank cascade system, stream networks, unsaturated and saturated zones were characterized and simulated successfully by the coupled model in an integrated manner. The model simulation has been evaluated through calibration and validation of simulated tank yield and head elevation values of observation wells with that of observed data. Three years from 2009 to 2011 of observed water level data of tanks and observation wells were used for the calibration and validation of the model. The model was calibrated over a period of one normal year from January 2011 to December 2011 and validated for one dry year from January 2009 to December 2009 and for one wet year from January 2010 to December 2010. The error matrix, correlation coefficient and Nash-Sutcliffe coefficient values of calibration and validation process indicate good simulation potential and prediction capability of the coupled model developed for the tank cascaded catchment. The scenario simulation, with and without considering tank cascaded system indicates large difference in the overland flow, ground water levels and recharging pattern in the saturated zone. The scenario simulation confirms the capturing of the effects of tanks by the coupled model and proves the importance of inclusion of surface water bodies as it has great influence on water balance analysis of an integrated modelling.
Page publiée le 17 février 2021, mise à jour le 20 janvier 2023