The Bonnet Carré Spillway (BCS) was constructed from 1929 to 1936 to protect the city of New Orleans from the Mississippi River floods. When the water stage of the Mississippi River is over 5.18 m of flood stage, BCS will be opened to divert the excessive flood water into the Gulf of Mexico through Lake Pontchartrain. During these flood release events, large amounts of freshwater, sediment and nutrients were discharged into the lake and significantly affected its water quality and aquatic environment. A numerical model (CCHE2D) developed at the National Center for Computational Hydroscience and Engineering (NCCHE), the University of Mississippi, was applied to simulate the dynamic process of hydrodynamics and associated temporal and spatial distributions of sediment, salinity and phytoplankton in Lake Pontchartrain due to the BCS flood release events. Three events occurred in 1997, 2008 and 2011, representing the median, low, and high flood discharge cases, were selected for this study. The simulated results were compared with field measured data and satellite imageries obtained from USGS, US Army Crop of Engineers and NOAA, and good agreements were obtained. The effects of nutrients and suspended sediment on the growth of phytoplankton as well as the occurrence of algal bloom in the lake were analyzed. The processes of salinity recovery in the lake were also discussed. The results obtained from this research provide useful information for analyzing the impacts of flood release event on the aquatic ecosystems in Lake Pontchartrain.

BonnetCarré溢洪道（BCS）建于1929年至1936年，目的是保护新奥尔良市免受密西西比河洪水的影响。当密西西比河的水位超过5.18 m的洪水位时，将打开BCS，将多余的洪水通过庞恰特雷恩湖转移到墨西哥湾。在这些洪水释放事件中，大量的淡水，沉积物和养分被排入湖泊，严重影响了其水质和水生环境。密西西比大学国家计算水科学与工程中心（NCCHE）开发了一个数值模型（CCHE2D），用于模拟流体动力学的动态过程以及相关的沉积物时空分布，由于BCS洪水释放事件，庞恰特雷恩湖的盐度和浮游植物。本研究选择了1997年，2008年和2011年发生的三起事件，分别代表中，低和高洪水流量。将模拟结果与从USGS，美国陆军工程师团和NOAA获得的现场测量数据和卫星图像进行了比较，并获得了良好的协议。分析了养分和悬浮沉积物对浮游植物生长以及湖中藻华发生的影响。还讨论了湖中盐度的恢复过程。这项研究获得的结果为分析洪灾事件对庞恰特雷恩湖水生生态系统的影响提供了有用的信息。本研究选择了高洪水流量的案例。将模拟结果与从USGS，美国陆军工程兵和NOAA获得的现场测量数据和卫星图像进行了比较，并获得了良好的协议。分析了养分和悬浮沉积物对浮游植物生长以及湖中藻华发生的影响。还讨论了湖中盐度的恢复过程。这项研究获得的结果为分析洪灾事件对庞恰特雷恩湖水生生态系统的影响提供了有用的信息。本研究选择了高洪水流量案例。将模拟结果与从USGS，美国陆军工程师团和NOAA获得的现场测量数据和卫星图像进行了比较，并获得了良好的协议。分析了养分和悬浮沉积物对浮游植物生长以及湖中藻华发生的影响。还讨论了湖中盐度的恢复过程。这项研究获得的结果为分析洪灾事件对庞恰特雷恩湖水生生态系统的影响提供了有用的信息。分析了养分和悬浮沉积物对浮游植物生长以及湖中藻华发生的影响。还讨论了湖中盐度的恢复过程。这项研究获得的结果为分析洪灾事件对庞恰特雷恩湖水生生态系统的影响提供了有用的信息。分析了养分和悬浮沉积物对浮游植物生长以及湖中藻华发生的影响。还讨论了湖中盐度的恢复过程。这项研究获得的结果为分析洪灾事件对庞恰特雷恩湖水生生态系统的影响提供了有用的信息。