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Tamil Nadu Agricultural University (2013)

Assessment of droughts and developing mitigation strategies in the parambikulam aliyar basin tamil nadu

Manikandan M. 

Titre : Assessment of droughts and developing mitigation strategies in the parambikulam aliyar basin tamil nadu

Auteur : Manikandan M. 

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) in Soil and Water Conservation Engineering 2013

Résumé partiel
Drought is a natural phenomenon that has significant impacts on the economy, environment, industries and the community. Identification of droughts provides useful information for planning and optimal operation of irrigation systems in a basin. Timely determination of the occurrence and level of drought will assist the decision making process to reduce the impacts of droughts. Early detection of droughts helps in implementing drought mitigation strategies and measures, before they occur. Therefore, assessment and prediction of droughts plays an important role in the planning and management of water resources systems, especially during dry climatic periods. Droughts are usually assessed and monitored by drought indices. These indices can be used to assist water managers to assess droughts effectively and forecast future drought conditions, which will allow them to plan ahead the water management activities during droughts. This investigation was focused on analyzing the drought characteristics in the Parambikulam-Aliyar Basin, Tamil Nadu, based on meteorological and hydrological variables. The Parambikulam-Aliyar Basin in Tamil Nadu was considered as the study area, since the management of water resources in this basin has great importance to irrigation, power generation and drinking water supply. The objectives of this study consisted of analysing the spatial and temporal variation of meteorological drought, assessment of hydrological drought occurrence, prediction of drought and suggestion of suitable mitigation measures. The indicators assessed in this study are : Standardized Precipitation Index (SPI) used for temporal and spatial analyses of meteorological drought by considering rainfall as the indicator of drought and Streamflow Drought Index (SDI) used to define hydrological drought by considering streamflow as the drought indicator. This study compared the meteorological and hydrological drought indices in the basin. Linear stochastic time series model known as autoregressive integrated moving average (ARIMA) model was employed in this study to predict drought using SPI values. Finally, suitable short, medium and long term strategies to mitigate the drought were suggested. The meteorological drought is defined as a lack of precipitation over a region for a period of time. The most commonly used Standardized Precipitation Index (SPI) was applied in this study to assess the meteorological drought. Gridded monthly rainfall data was developed using monthly rainfall data from 28 raingauge stations over PAP basin for the period from 1972 to 2011. The SPI calculated from the monthly gridded rainfall data at multiple time scales is used for temporal and spatial analyses of meteorological drought. The use of multiple time scales helps to assess the different types of droughts. The annual drought Severity-Areal extent-Frequency (SAF) curves were developed which can assess the return period of worst drought with respect to severity and areal extent of the localized drought within the basin. Finally the probability of change in drought severity and the persistence of four drought categories using a transition probability approach were estimated

Présentation et version intégrale (Shodhganga)

Page publiée le 18 avril 2021