Evaluation of the Effective Drought Index in the Analysis of Daily Drought Frequency Using SPI

Given that drought analysis using this method requires strong images and interpretive tools, and its preparation always faces certain problems, it has not developed much in developing countries such as Iran. Drought Monitoring Most drought monitoring systems are based on meteorological data. These systems play a valuable role as a first step in drought assessment. Meteorological data can be used in conjunction with other data and information to estimate the impact of drought. Understanding the extent of any level of drought requires different types of data, depending on the purpose for which drought is being defined. The most common data for all types of drought is precipitation. Hydrological drought monitoring requires precipitation, evapotranspiration, and information on the water holding capacity of soils in catchment areas. For agricultural drought assessment, data on soil type, texture, water holding capacity, surface slope, soil mass density, irrigation management, etc. are required. Drought monitoring is an important factor in drought management, especially in drought-prone and drought-exposed areas. Drought monitoring is a system that allows for continuous monitoring of climatic and hydrological parameters and their changes, and estimates of the probability of occurrence, severity, and extent of drought. The overall goal of drought monitoring is to provide information that encourages people and responsible organizations to take actions that increase the reliability of planning and reduce the damage caused by drought. Drought Forecasting Various studies show that drought, especially meteorological and agricultural drought, is the result of a There is no single, specific factor that can be predicted in advance, but rather drought is the result of several factors that gradually accumulate and create the conditions that are called drought. In other words, drought does not have specific boundaries and limits that can be accurately described and predicted (Alizadeh ۴۰۹۴). In recent years, efforts have been made to scientifically predict droughts and to examine the role of systems that interact with each other, which are called remote sensing, so that climate change and the occurrence of droughts in different places can be predicted based on that. This research has been somewhat successful, especially in tropical and humid regions of the world.

کلیدواژه ها:

Drought index assessment. ، Analysis of daily drought frequency. ، Using SPI index