Amanzi abalulekile ekukhiqizeni izitshalo. Kodwa iminyaka, ososayensi okuhlanganisa no-Jonathan Proctor, Ph.D. I-Phys.org.
“Ucwaningo oluhlaziya ukuthi izivuno zezitshalo zisabela kanjani emazingeni okushisa nemvula zivame ukukhombisa ukuthi izinga lokushisa libaluleke kakhulu kunamanzi, yize i-physiology yezitshalo siyaqonda ukuthi ukuhlinzekwa kwamanzi kubaluleke ngempela ezitshalweni,” kusho uProctor, umfundi oneziqu eqenjini likaPeter Huibers eHarvard John A. Paulson School of Engineering and Applied Sciences (SEAS). "Ukuxazulula le ndida kubalulekile ekulinganiseni ukuthi ukuguquka kwesimo sezulu kuzothinta kanjani isivuno sezitshalo zomhlaba wonke."
Ithimba labacwaningi belinombono wokuthi: kuthiwani uma amamodeli ekala uhlobo olungalungile lwamanzi? Esikhundleni sokulinganisa imvula, njengoba kwenziwa ezifundweni ezedlule, ithimba lase-Harvard lasebenzisa amasathelayithi ukukala umswakama womhlabathi ozungeze indawo yezimpande.
Ithimba lithole ukuthi amamodeli asebenzisa idatha yokuswakama kwenhlabathi achaza ukuhlukahluka okungaphezulu kokungu-30% kuya ku-120% ekuvunweni kwesitshalo kuya kwesinye eminyakeni edlule kunamamodeli athembele emvuleni.
"Ukuna kwemvula nomswakama womhlabathi kungahluka kakhulu ngenxa yokuhwamuka, ukungena nokugeleza," kusho uProctor.
Lisebenzisa ukuhlola ngesathelayithi umswakama wenhlabathi kanye nendlela yezibalo, ithimba lakwazi ukuhlukanisa kangcono futhi liqonde imiphumela ngayinye yokushisa namanzi ezitshalweni, ezivame ukudideka ngenxa yokuthi ukushisa nokomisa kuhlobene kakhulu.
Ikakhulukazi, abacwaningi bathole lokho ukushisa okukhulu yenza umonakalo omncane ukukhiqiza izitshalo kunalokho obekubikezelwe ngaphambilini, kunciphisa ukulahleka kokufudumala okulindelekile. Kodwa ososayensi baphinde bathola ukuzwela okukhulu esomiso nezikhukhula.
Uma kukhulunywa ngokubikezela ukusebenza Ezolimo Esimweni sezulu esishintshayo, kufanele kucatshangelwe ukuthi amazinga okushisa nokutholakala kwamanzi kuzoshintsha kanjani. Uma kuqhathaniswa nezinga lokushisa, izinguquko ngaphakathi ukutholakala kwamanzi kuzoba ngokwesifunda nangesizini, ngakho amasu okuhlela izifunda kanye nokubusa kuza phambili ekulweni nokuguquguquka kwesimo sezulu.