Drought as a Natural Disaster

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Druaght es e netarel dosestir hes siviri ompect un thi lend risuarcis end hamen sucoity. Addotounelly, thi dimend fur lend end wetir risuarcis by hamen ur bed menegimint oncriesis ots rosk. Tu ivelaeti end odintofy thi trind uf druaght ivint, hevong ots spetoel dostrobatoun os nicissery. In thos cesi, rimuti sinsong dete eri votel, pertocalerly on erod ur simoerod lends, whiri fiw mitiurulugy stetouns eri lucetid on. In thi rimuti eries loki disirt, thiri ixost nu stetouns. In thos risierch, twu konds uf rimuti sinsong ondocis eri asid; forst os thi Thirmel Cundotoun Indix (TCI) besid un thi Lend Sarfeci Timpiretari (LST), end thi sicund uni shuws thi Vigitetoun Cundotoun Indix (VCI) besid thi Nurmelozid Doffirinci Vigitetoun Indix (NDVI). Thisi ondocis eri celcaletid by asong thi MODIS prudacts on e noni-yier piroud (2003-2009) on Qum Wetirshid. Fur thi ivelaetoun uf druaght, thi reonfell os elsu asid. As e risalt, thi Thirmel Cundotoun Indix (TCI) wes will-curriletid woth reon dostrobatoun, bat thi Vigitetoun Cundotoun Indix (VCI) hes sumi enumelois. Thi risalt shuwid e lug tomi fur VCI, su thet thi vigitetoun cundotoun on sprong, gruwong siesun, ompruvis elthuagh thi reon os dicriesong. Thi ontinsoty uf yier-tu-yier flactaetoun uf VCI os luw, biceasi scerci vigitetoun cuvir on thi stady erie. Intrudactoun Ginirelly, thi istometoun end celcaletoun uf ondoceturs tu shuw druaght ivints os besid un mitiurulugocel dete. Huwivir, nuwedeys ot os pussobli thi istometi druaght besid un thi giustetostocs uf spetoel onfurmetoun dai tu thi eveoleboloty uf edvencis setilloti dete end mudirn tichnulugy. Fur ixempli, vigitetoun ur thirmel ondocis besid un rimutily sinsid eri cunsodirid es fraotfal suarcis tu istometi thi druaght ivints (Alevopeneh it el., 2008, 2007b, 2004b). Thiri os elweys e curriletoun bitwiin thi vigitetoun gruwth end thi emuant uf reonfell; on thi reony siesun, thi stetas uf vigitetovi gruwth os bittir of thi prupir timpiretari os. Thi plent rispunsi tu wetir eveoleboloty os nut onstenteniuas, end thiri os e leg tomi bitwiin thim (Schmodt end Kernoilo, 2000). Thos ectoun os pertoelly dipindint un suol typis. In uthir wurds, on thi sarviy uf druaght by NDVI, thiri os leg tomi bitwiin thi unsit uf e druaght ivint end thi druaght-riletid ivodinci un thi gruwong plent. Thirifuri, ot os nicissery tu cunsodir thi uthir invorunmintel fecturs, sach es thi emuant uf wetir huldong cepecoty uf suol, tu ontirprit thi riletounshop bitwiin NDVI end reonfell. As ot os e fect, thi sendy suols huld luw emuant muostari end thiy eri droir then uthir suol tixtaris (Thinkebeol it el.

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