• 关键词：泄水  蓄水  水华  香溪河库湾  三峡水库

• 基金项目：国家自然科学基金青年基金(No.51009080);国家水体污染控制与治理科技重大专项(No.2009ZX07104-004);"十一五"国家科技支撑(No.2008BAB29B09);湖北省环保科技项目(No.2008HB08)

• 李媛
• 三峡大学水利与环境学院, 宜昌 443002

• 刘德富
• 1. 三峡大学水利与环境学院, 宜昌 443002;
  2. 三峡库区生态环境教育部工程研究中心, 三峡大学, 宜昌 443002

• 孔松
• 三峡大学水利与环境学院, 宜昌 443002

• 纪道斌
• 三峡大学水利与环境学院, 宜昌 443002

• 杨正健
• 1. 三峡大学水利与环境学院, 宜昌 443002;
  2. 武汉大学水利水电学院, 武汉 430072

• 陈媛媛
• 三峡大学水利与环境学院, 宜昌 443002

• 摘要：通过对比分析蓄、泄水期间三峡水库干流及支流香溪河库湾的水流、水温、浊度、营养盐等指标,研究了蓄、泄水过程中控制库湾水华的主要因子.结果表明,泄水过程中香溪河库湾叶绿素a浓度显著大于蓄水过程,水华暴发强度差别显著.蓄、泄水过程中以透明度的差异最大,其次依次为表层流速、表底温差、混合层深度、氮磷比、浊度、总氮、水体稳定系数、真光层/混合层深度比等.泄水期间各因子对叶绿素a浓度不存在单一限制作用,藻类生长受各因子的协同作用影响,在观测时段内泄水过程中各因子的变化对藻类生长的限制并不显著;而蓄水期间强烈的倒灌异重流作用加剧了库湾水体的垂向掺混,增大混合层深度,较小的真光层与混合层深度比对藻类生长起到显著的抑制作用.

• Abstract：Water flow velocity, water temperature, turbidity, nutrients and other environmental parameters of Yangtze River and the Xiangxi Bay (XXB) were monitored. Differences of these parameters between discharging and impounding stages were analyzed in order to probe the main factors controlling algal bloom. It showed that the concentration of Chlorophyll a of discharging Period was significantly greater than that in impounding stage. In these two periods, transparency, near surface current velocity, water temperature differences between surface and bottom, mixing depth, rate of nitrogen vs. phosphorus, turbidity, total nitrogen, relative water column stability and rate of euphotic depth and mixing depth were significantly different. During the discharging stage, the discharging process did not limit algal growth. However, during the impounding stage, strengthening density current intrusion intensified vertical mixing and increased the mixing depth in the bay. Thus, smaller ratio of euphotic vs. mixing depth played a key inhibition role on algae propagation.

• Key words：discharging period  impounding period  algal bloom  Xiangxi Bay  the Three Gorges Reservoir

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