摘要
在现场调查和钻探的基础上,采集了沐官岛水库库区3种典型底质(粉质粘土、泥质粉沙和中细砂)的原状/扰动土样和地表水样,然后分别采用静水土柱和动水水槽试验测定盐分的时-空变化规律,最后定量计算出不同底质盐分的释放通量,从而为该海湾水库蓄水初期水质的评价和预测提供了科学依据。土柱试验表明,在分子扩散作用下高盐分区主要集中在水-沉积物界面之上7.5 cm的范围内,7.5 cm之上的水体盐分较为均一,底质盐分释放通量按粉质粘土、中细砂、泥质粉沙的顺序递减,盐分释放通量符合负的幂指数形式,而且抽排界面之上高浓度水体对降低水体盐分含量效果显著。根据水槽模拟试验,风的吹拂会影响到界面之上水体盐分的分层,有利于海湾水库中盐分的混合作用。
Based on the field investigation and drilling, three kinds of original/disturbed sediments and the local surface water were sampled around the Muguandao Reservoir. Then, the temporal-spatial variation in salinity was measured carefully through the column and tank tests. At last, the salt fluxes released from the deposits were calculated. This research lays a scientific foundation for the evaluation and prediction of the water quality in the reservoir. According to the column tests, it is found that a 7.5 cm high salinity zone is formed near the interface due to molecular diffusion, and the salt concentration is relatively low and homogeneous above that level. In addition, the salt released fluxes can be expressed as the negative exponential functions, and they decrease in order of the silty clay, the medium-fine sand and politic silt. The tank tests show that wind may influence the salt stratification above the interface, which is favorable to salt mixture in the reservoir.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2006年第2期170-175,共6页
Advances in Water Science
基金
青岛市科技攻关资助项目(2003)
关键词
海湾水库
沉积物-水界面
盐分交换
polder reservoir
sediment-water interface
salt exchange
