摘要
针对中国北方海湾水库间歇来水、连续取水和沉积物动态释盐的特点,建立水量与盐分耦合的数学模型,以青岛拟建的沐官岛水库为例,探讨水位变化条件下混合型海湾水库库水盐分的影响因素、超标风险与达标条件。模拟结果表明,在水库水位连续降低条件下,毫米量级的日蒸发量对库水盐分的累积效应显著。在不利水文条件下,受沉积物释盐、水分蒸发与人工取水的影响,混合型海湾水库长期存在盐分超标的风险。与水位不变时相反,水位降低时库水盐分浓度随着取水量的增大而升高;因此,当库水盐分存在超标风险时,可以通过减少日取水量实现库水盐分达标。为保障安全供水,在海湾水库设计与运营管理阶段,均需要综合考虑水量-盐分因素进行水库的日取水量调算。
An estuarine reservoir in northern China is characterized by intermittent inflows,continuous outflow,and dynamic salt release from sediments. We developed a quantitative model coupling water quantity and salinity,and using the proposed Muguandao reservoir as an example,examined factors that influence salinity,specifically those that cause it to exceed the standard. We also explore methods to maintain standard salinity levels in a mixed estuarine reservoir. The results showed that the cumulative effects of millimeter-scale evaporation on salinity in reservoir water are noticeable when the water level decreases. Under adverse hydrological conditions,salinity in a mixed estuarine reservoir,affected by salt release from sediments,evaporation,and water outflow,tends to exceed the standard. In contrast with the constant water level conditions,salinity increased with increasing water outflow when water levels decreased.Therefore,decreasing daily outflow could help maintain salinity standards. To ensure water quality safety,the daily available water as determined from the integration of water quantity and salinity,should factor in the management of an estuarine reservoir.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2017年第5期763-769,共7页
Advances in Water Science
基金
国家自然科学基金资助项目(51279075)
山东省自然科学基金资助项目(ZR2009EQ001)~~
关键词
海湾水库
盐分
水位
蒸发
取水量
沉积物-水界面
estuarine reservoir
salinity
water level
evaporation
water outflow
sediment-water interface
