福建省山仔水库水体季节性分层特征研究

对福建省敖江流域山谷型的山仔水库2005年水温和水化学(DO、pH、总溶解性磷质量浓度)进行监测,结果表明:山仔水库的水温在3-11月之间保持稳定分层,在夏季形成明显分层,这种温度分层结构有效限制了上下水团的混合,形成显著的水体溶解氧分层,特别是夏季由于有机物的消耗,在沉积物-水界面形成厌氧层;12月至次年1-2月随着水体表层气温的急剧下降,水体分层结构失稳,水库上下层水体垂直交替,底部厌氧释放的还原性物质被带入上层湖水,说明水温季节性的分层对山仔水库水质的变化起重要作用.

Research of the Characteristic of the Seasonal Thermal Stratification in Shanzi Reservoir, Fujian Province

Surveied the water temperature and hydro chemical parameters during the twelve monthes in 2005 of Shanzi reservoir of Fujian province.The result showed that an clear thermal stratification had been formed at the vertical profile of water column from March to November in shanzi reservoir.It could cause very strong stratification of the dissolved oxygen especially in summer and there was an anoxic hypolimnion companying with processes of organic maters degeneration between the surface sediment and the overlying water.The results also confirmed that unstable of the thermal stratification caused by surface cooling of water when the air temperature decreased abruptly from twelve to the next January and February would lead to a vertical convection between the upper layer water and the deep layer water.The reductants formed in the anoxic hypolimnion would be brought to the epilimnion through the vertical eddy diffusion.This study showed that the seasonal thermal stratification could play a key role in change of water quality in shanzi reservoir.