Abstract
Abstract. In order to organize water for drought resistance reasonably, we need to study the relationship between irrigation water demand and meteorological drought in quantitative way. We chose five typical irrigation districts including the Qingtongxia irrigation district, Yellow River irrigation districts of Inner Mongolia in the upper reaches of the Yellow River, the Fen river irrigation district and the Wei river irrigation district in the middle reaches of the Yellow River and the irrigation districts in the lower reaches of the Yellow River as research area. Based on the hydrology, meteorology, groundwater and crop parameters materials from 1956 to 2010 in the Yellow River basin, we selected reconnaissance drought index (RDI) to analyze occurrence and evolution regularity of drought in the five typical irrigation districts, and calculated the corresponding irrigation water demand by using crop water balance equation. The relationship of drought and irrigation water demand in each typical irrigation district was studied by using grey correlation analysis and relevant analysis method, and the quantitative relationship between irrigation water demand and RDI was established in each typical irrigation district. The results showed that the RDI can be applied to evaluate the meteorological drought in the typical irrigation districts of the Yellow River basin. There is significant correlation between the irrigation water demand and RDI, and the grey correlation degree and correlation coefficient increased with increasing crops available effective rainfall. The irrigation water demand of irrigation districts in the upstream, middle and downstream of the Yellow River basin presented different response degrees to drought. The irrigation water demand increased 105 million m3 with the drought increasing one grade (RDI decreasing 0.5) in the Qingtongxia irrigation district and Yellow River irrigation districts of Inner Mongolia. The irrigation water demand increased 219 million m3 with the drought increasing one grade in the Fen river irrigation district and Wei river irrigation district. The irrigation water demand increased 622 million m3 with the drought increasing one grade in the downstream of Yellow River irrigation districts.
Highlights
The Yellow River Basin is one of the areas hardest hit by drought in history due to its low rainfall and high evaporation
Based on the analysis of existing drought evaluation method and characteristic, we use reconnaissance drought index (RDI) drought index to evaluate the drought condition in main irrigation districts of Yellow River in 1956 to 2010, the evaluation results are basically consistent with recorded drought of irrigation district of Yellow River, which shows that it is suitable for the drought evaluation of irrigation district of Yellow River
From the view of development trend of drought of irrigation district as evaluated by RDI, the drought degree of irrigation districts in the upper, middle reaches of Yellow River increases to some extent, the drought degree of irrigation districts in the lower reaches somewhat decreases
Summary
The Yellow River Basin is one of the areas hardest hit by drought in history due to its low rainfall and high evaporation. Over the past 3710 years from 1766 to 1944 BC, the Yellow River basin experienced 107 droughts recorded in history. In the past 20 years, severe droughts occurred many times in the upper and middle reaches of the Yellow River Basin, resulted in a significant yield reduction and very difficult to get drinking water for local people. Since 2000, the Yellow River almost saw successive years of drought, severe drought occurred in 2008 and 2010, resulted in agricultural huge losses. Yellow River Basin is a resource-based water shortage area, contradiction in water supply and demand in arid years becomes more prominent, irrigation water is limited, in this sense, the quantitative study of the relationship between meteorological drought and irrigated water demand is of great significance for the rational organization of irrigation water. Take the main irrigation districts of Yellow River basin as the study areas; this paper presents the quantitative study of the relationship between irrigation requirement and meteorological drought, aims to providing a scientific basis for the Yellow River drought mitigation
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