【作者】 王同成；

【导师】 逄勇； 范成新；

【作者基本信息】 河海大学 ， 环境工程， 2007， 硕士

【摘要】 在内源动态问题越来越成为国内外研究热点中，国内外学者对极端风情（台风）过程下湖泊水体营养盐的变化机制却研究较少。本论文选择太湖沉积物-水界面为主要研究对象，利用沉积物再悬浮发生装置，室内模拟2004年卡努台风对太湖典型湖区水土界面的影响，旨在揭示极端风情（台风）过程下水体中营养盐的变化情况，为湖泊内源负荷研究提供科学依据，为水动力模拟装置提供精细操控参数。本文研究取得的主要研究结果如下：1、在极端风情（台风）过程中，风浪扰动的平均侵蚀深度在毫米量级，SS负荷量13.3×10⁶吨，约为静态负荷量的23倍。2、梅梁湾湖区和大浦口湖区水体NH₄⁺—N浓度随着台风历时的增加而减少，而DTN浓度略有增加，表明了台风过程下水体中NH₄⁺—N向NO₂^-—N转化，从而降低了水体中的NH₄⁺—N浓度。3、在台风过程中，梅梁湾湖区和大浦口湖区水体PO₄^3-—P浓度随着台风历时的增加而升高，DTP浓度略有增加。表现为沉积物向水体释放磷。4、台风过程后沉积物表层总磷含量较台风前有所下降，而弱吸附态磷、铁结合态磷、铝结合态磷、有机磷含量均有增加。5、太湖全湖静、台风风情下营养盐负荷量计算结果表明：在台风风情下，湖泊水体中PO₄^3-含量增加，PO₄^3-含量由静态负荷量57.6吨增加到66.8吨；湖泊水体中NH₄⁺含量由静风风情的741.9吨下降到438.5吨。更多还原

【Abstract】 When the release of sediment became a more and more important internationalproblem, the research of nutrients transform mechanism in lakes in ultra-wind（typhoon） is few. This paper selected sediment-water interface in lake Taihu as themain research object, simulating the effects induced by Kanu typhoon tosediment-water interface in typical area of Lake Taihu indoors by sedimentresuspension equipment, is mainly to uncover the change state of nutrients in thewater body in ultra-wind （typhoon）, provides scientific basis for the research ofsediment burdens in lakes and precise manipulate parameters for hydraulicsimulation equipments. The main research results of this paper are below:1．During the ultra-wind （typhoon）, average wind disturb depth of the sedimentis in millimeter, the loading of SS is 13．3×10⁹ kilogram, which is 23 times of staticloading.2．The concentration of NH₄⁺-N in Meiliangwan area and Dapukou areadecreased during the typhoon, but the concentration of DTN increased, whichindicates the NH₄⁺-N transfer to NO₂^--N, thus the concentration of NH₄⁺-N inthe water body decreased.3．During the typhoon, the concentration of PO₄^3--P increased, theconcentration of DTP increased little, which indicates the release of phosphorus fromthe sediment.4．After the typhoon, TP in the surface layer of the sediment decreased, butlabile phosphorus, iron bounded phosphorus, aluminum bounded phosphorus,organic phosphorus increased.5．The numerical results of nutrients under static state and typhoon state inTaihu Lake indicate: during the typhoon, PO₄^3- in the water body increases from57．6×10³ kilogram （static loadind） to 66．8×10³ kilogram, NH₄⁺in the water bodydecreases from 741．9×10³ kilogram （static loadind） to 438．5×10³ kilogram.更多还原