To map the drought risk you should consider the meteorological criteria such as precipitation and evaporate-transpiration. However, to integrated analysis you can consider the agricultural characteristics such as soil chemical and physical properties or climatic requirements of each cultivation. Standardized precipitation index (SPI) is one of the empirical models in drought risk assessment, which mainly relates to precipitation factor and represents the applicable results.
To map the drought risk you should consider the meteorological criteria such as precipitation and evaporate-transpiration. However, to integrated analysis you can consider the agricultural characteristics such as soil chemical and physical properties or climatic requirements of each cultivation. Standardized precipitation index (SPI) is one of the empirical models in drought risk assessment, which mainly relates to precipitation factor and represents the applicable results.
All of the above are important, but also the land use/type of agriculture should be considered. Water consumption, resistance during droughts, impact of droughts on end product should be considered. On top of each type of agriculture, also land management should be considered: conservation agriculture, permaculture, arboriculture should be considered as well.
The question is not clear.Does Behrooz wants to know which drought index is appropriate for regional assessment of drought?Once the question is clear I can answer.
Dear Puppala Vijaya Kumar
i want determine agriculture drought risk spatial distribution .
i use drought index which can useful for rationalization.
Dear Behrooj
Spatial distribution o drought risk cannot be assessed by the data of a single station. Spatial assessment of drought can be done through network of weather observatories or by the help of satellite based indices.The problem with drought assessment is that it has so many definitions and indices.For assessing meteorological droughts SPI or normalized deviation of rainfall can be used.For agricultural droughts Moisture adequacy index or some other water balance and crop specific indices can be used.
To comment, it is important to consider that for the implementation of national plans in many countries aimed at managing climate risks, some of the first questions slated arise during the generation of these plans are: Every few years we can expect a severe hydrometeorological events, such as drought, can affect our territory?, Are there more vulnerable than others to the occurrence of severe drought areas? What is the probability that any one year deficit of over 80% of the annual rainfall in our region or locality? May occur. Are we currently experiencing the worst drought in 100 years?
Among the many parameters related to drought exposure, agricultural system sensitivity and system's adaptive capacity, I feel that highest weight has to be given to availability of irrigation to spatially map drought risk. So any index which takes into account the availability of surface/subsurface irrigation, should do a better job. You may refer to these two publications which may help you in firming up your ideas.
1) R. Dhakar, V.K. Sehgal, S. Pradhan (2013). Study on inter-seasonal and intra-seasonal relationships of meteorological and agricultural drought indices in the Rajasthan State of India. Journal of Arid Environments 97, 108-119. DOI:http://dx.doi.org/10.1016/j.jaridenv.2013.06.001
(2) http://www.nicra-icar.in/nicrarevised/images/Books/Vulnerability%20of%20agriculture%20to%20climate%20change.pdf
Both are mentioned in research-gate under my account.
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