宁夏灌区退水对黄河封河期防凌调度的影响
Yellow River(2010)
Abstract
对1991—2008年宁夏灌区引、退水规律,以及冬灌退水对宁蒙河段防凌调度的影响进行了分析。结果表明:宁夏灌区退水过程滞后于引水过程,但变化与引水趋势相似,集中在5—8月和11月份,这两个时段退水量占年总退水量的94%,灌区退水与降水量、地下水位和蒸发量相关。对冬灌退水规律分析发现,退水对黄河宁蒙河段持续流凌10~15d的凌情影响不大,但对11月上中旬强冷空气降温造成流凌后迅速封河的凌情威胁较大。
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Key words
Ningxia-Inner Mongolia Section,ice run control and regulation,Ningxia irrigation area,the Yellow River,recession law
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