摘要
通过模拟太湖底泥疏浚,研究了不同水土比与不同环境因素条件下,底泥中氮、磷等营养物的释放规律与较长时期的模拟疏浚环境效果。结果表明,底泥中细小颗粒物、较高的水温、置水和厌氧条件等是促进底泥中磷释放的主要环境因素。从模拟太湖底泥的淤积现状上看,以平均模拟疏浚深度为25cm环境效果最佳,在沉积物粒度较细的湖区,可以适当加深;底泥疏浚应在冬季等水温低的季节进行,这样可以有效地防止其中营养物向上覆水体的释放。
Eutrophication of water-body now is one of the main environmental phenomena all over the world, which results from the out input of pollutants and the release of nitrogen and phosphorus nutrients in sediment, especially, the release from inner resource when the out input of pollutants controlled effectively, so sediment dredging is a broadly adoptive engineering measure. The past researches on the release of nitrogen and phosphorus nutrients in sediment were focused on the same proportion of water to sediment, but no dynamic affects of environmental factors on the release of nutrients after sediment dredging. The release of nitrogen and phosphorus nutrients in sediment from Taihu Lake and long-time effects of simulation dredging under different proportion of water to sediment were studied. The results indicated that the smaller size particles in sediment, higher water temperature, water exchanging and anaerobic condition were all the key factors to increase the release of nitrogen and phosphorus nutrients in sediments, but their effects varied greatly with the proportions of water to sediment. All the conditions considered, 25 cm simulation depth of sediment dredging was best, but it could be more in the area covered by the sediment of smaller size particles. The lower the water temperature, the less the release of nitrogen and phosphorus nutrients in sediment, and winter was the best season for sediment dredging with lower release nitrogen and phosphorus nutrients from sediment to water.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2005年第3期521-525,共5页
Journal of Agro-Environment Science
基金
"十五""211工程"重点学科建设子项目
上海市重点学科资助
关键词
太湖
底泥疏浚
氮、磷营养物释放
评价
Taihu Lake
simulating sediment dredging
release of nitrogen and phosphorus
assessment
