Drought vulnerability assessment in Karnataka : Through composite climatic index
Drought vulnerability assessment in Karnataka : Through composite climatic index
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卡纳塔克邦的干旱脆弱性评估：通过综合气候指数
DOI：
10.54302/mausam.v70i1.183
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发表时间：
2021
期刊：
影响因子：
0.6
通讯作者：
O. Challa
中科院分区：
文献类型：
--
作者：
G. Srinivasareddy;H. S. Shivakumarnaiklal;N. Keerthy;Prasad Garag;E. Jothi;O. Challa
基于西南季风期间降水变异系数(SWM-CV)、东北季风期间降水变异系数(NEM-CV)、干旱指数距平(AIA)、前季风平均雨日数(PMARD)、西南季风平均雨日数(SDWD)、东北季风(NEARD)和年平均雨日(ANNARD)等7个子成分，建立了卡纳塔克邦气候干旱脆弱性综合指数。在上述7个子成分中，前3个子成分与气候干旱脆弱性指数呈正函数关系，其余4个子成分与气候干旱脆弱性指数呈负函数关系。176名塔鲁克人的综合指数值服从正态分布，均值和标准差均符合正态分布。根据塔鲁克一级指数的最大值和最小值，形成了5个固定级别间隔的类别(1至5个)，这些类别描述了渐进式干旱脆弱性，并将这些类别分配给每个塔鲁克人。根据这一气候干旱脆弱性指数等级，观察到82个塔鲁克(47%)为高度脆弱(4级)，50个塔鲁克(28%)为高度脆弱(5级)，27个塔鲁克(15%)为中度脆弱(3级)，11个塔鲁克(6%)为轻度脆弱(2级)，6个塔鲁克(4%)为极轻度脆弱(1级)。在该邦的四个地区中，南卡纳塔克邦(87%)和北卡纳塔克邦(97%)的大多数塔鲁克人非常容易遭受干旱，其次是马尔纳德(36%)和沿海地区(5%)。可以计划在受影响的塔鲁克州实施旨在恢复生态环境和确保人民和牲畜可持续发展的抗旱措施。
A composite climatic drought vulnerability index based on seven sub-components such as the coefficient of variation of rainfall during south west monsoon (SWM-CV), north east monsoon (NEM-CV), aridity index anomaly (AIA), Average rainy days during pre-monsoon (PMARD), south west monsoon (SWARD), north east monsoon (NEARD) and annual (ANNARD) was developed at taluk level for the state of Karnataka. Out of the above seven subcomponents the first three were found to have positive functional relationship while the other four sub-components have negative functional relationship with climatic drought vulnerability index. These composite index values of 176 taluks were subjected to normal distribution with mean and standard deviation. Based on maximum, minimum values of the indices at taluk level, five classes (1 to 5) at fixed class interval that depict progressive drought vulnerability are formed and these classes were assigned to each of the taluks. As per this climatic drought vulnerability index class, it is observed that 82 taluks (47%) are highly vulnerable (class-4), 50 taluks (28%) are very highly vulnerable (class-5), 27 taluks (15%) are moderately vulnerable (class-3), 11 taluks (6%) are slightly vulnerable (class-2) and 6 taluks (4%) are very slightly vulnerable (class-1). Among the four regions in the state, majority of the taluks in South Interior Karnataka (87%) and North Interior Karnataka (97%) are highly and very highly drought vulnerable followed by Malnad (36%) and Coastal region (5%). The drought mitigation measures to restore the eco-environment and to ensure sustainability of the people and livestock could be planned for implementation in the affected taluks of the state.