Spatial variation of groundwater guarantee extent in typical well irrigation area of North China Plain
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Abstract:
Nor th China Plain( NCP) is an important g rain product ion base in China, and gr oundwater is the main ir rigation w ater resource. However , g ro undwater r esource has significantly spatial var iation. In o rder to r eveal the spatial variatio n of g roundw a2 ter guarantee ex tent fo r g rain production in NCP, an evaluatio n index system o f g ro undwater g uarantee ex tent w as develo ped o n the basis of thr ee t ypical r egions including Baoding of pediment plain, Dezhou of central plain, and Cangzho u of coastal plain. The cr op w at er requirements in the three typical r egions w ere calculated using penman equatio n, and gr oundwat er g uarantee ex2 tents wer e analyzed using the statist ical evaluation method. T he results indicated that the annual av erag e g ro undwater g ua rantee ex tent for gr ain pr oductio n is the middle level in Baoding while the infer ior level in Dezhou and Cang zhou; g ro undwater guaran2 tee ex tent incr eases with t he increasing o f pr ecipitatio n, and it can increase by 4. 9% in Baoding , 1. 6% in Dezhou, and 0. 6% in Cangzhou wit h the increasing of 100 mm pr ecipitation; and g ro undwater g uar ant ee ext ents o f Baoding, Dezhou, and Cangzhou ar e in the log arithmic no rmal dist ribution in the future 50 year s( 2011 to 2060) , and the main pro bability o f Baoding co rresponds to the middle level w ith the pro babilit y of 0. 726 w hile the ma in pro bability of Dezhou and Cang zho u cor responds to the ex tr emely inferio r level w ith the probability o f 0. 577 and 1, r espectiv ely.
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