中文摘要：

【目的】获取准确的水质参数分布情况,进而对水质参数与动力作用复杂的河口水域环境进行综合评价。【方法】利用2011年5月30组长江口水域的遥感反射率数据,在尝试多种波段组合以及不同函数形式后,针对叶绿素a浓度和总悬浮物浓度分别建立最优经验反演模型。【结果】对总悬浮物浓度,波段差值（634644nm）的二次函数形式最优,决定系数R2为0.837,均方根误差（RMSE）为0.226mg·L-1,利用独立的验证样本得到平均绝对百分比误差（MAPE）为58.2%。对叶绿素a浓度,波段比值（650nm/644nm）的二次函数形式最优,R2为0.552,RMSE为0.486mg·m-3,利用独立的验证样本得到MAPE为66.2%。将模型运用于2011年5月MERIS卫星数据,反演出长江口水域叶绿素a浓度与总悬浮物浓度空间分布图,叶绿素a浓度呈现出从河口向外海逐渐减少的趋势,最大值出现在舟山群岛附近。总悬浮物浓度呈阶梯状向外海减少。【结论】通过评价参数可看出,总悬浮物浓度反演模型对总悬浮物浓度反演效果较为准确,而叶绿素a浓度反演模型显示对叶绿素a的反演浓度较低。

英文摘要：

【Objective】In order to grasp the distribution map of water quality parameters more accurately,we evaluate the estuary which has complex dynamical system.【Methods】After using30 in situremote sensing reflectance data collected in May 2011 and trying many kinds of band combinations and function forms,the optimal empirical models for chlorophyll-a concentration and total suspended matter concentration were established.【Results】For total suspended matter concentration,Quadratic function model by band difference（634644nm）performs best,ofwhich coefficient of determination（R2）is 0.837 and root mean square error（RMSE）is 0.226mg·L-1.In the model validation,the mean absolute percentage error（MAPE）by using the independent dataset shows a value of 58.2%.For chlorophyll-a concentration,quadratic function model by band ratio（650nm/644nm）performs best,of which coefficient of determination（R2）is 0.552 and root mean square error（RMSE）is 0.486 mg·m-3.In the model validation,the mean absolute percentage error（MAPE）by using the independent dataset shows a value of66.2%.The MERIS satellite data in May 2011 were evaluated by the models,and the distribution map was obtained for spatial concentration of chlorophyll-a and total suspended matter ofthe Changjiang Estuary through simulation.There was a trend that the concentration of chlorophyll-a decreased gradually from the estuary to the sea,and the maximum value appeared in the Zhoushan Islands.The concentration of total suspended matter reduced stepwisely to the sea.【Conclusion】As is shown in the evaluation parameters,the total suspended matter concentration model has accurate effect in retrieve water quality while the chlorophyll-a concentration model has lower effect.