湖泊垂直非均匀水体悬浮物对遥感反射率的影响机制—以鄱阳湖光学深水区为例

项目名称： 湖泊垂直非均匀水体悬浮物对遥感反射率的影响机制—以鄱阳湖光学深水区为例

项目编号： No.41461080

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 江辉

作者单位： 南昌工程学院

项目金额： 51万元

中文摘要： 随着湖泊生态环境问题的日益突出，研究遥感高精度定量反演湖泊水色要素具有重要现实意义。悬浮物是湖泊水色要素中的关键参数，内陆湖泊水体复杂多变，垂直非均匀水体普遍存在，因此研究垂直非均匀水体悬浮物的光学传递问题与遥感精确度之间的关联迫在眉睫；然而人们对湖泊垂直非均匀水体的光学性质却尚少研究。本项目以鄱阳湖光学深水区为例，对不同时期鄱阳湖水体表观光学参数和垂向固有光学参数进行实地监测，分析不同水体悬浮物垂向固有光学性质的时空变异性，建立湖泊非均匀水体光学物理量垂直结构参数化模型；同时引入到两流辐射传递模型中，建立适合于湖泊非均匀水体的光学垂向模型，获取湖泊垂直分布的反射率和水面上遥感反射率。研究在水动力、水体悬浮物组分、浓度、粒径等垂向分布下的遥感反射率、悬浮物浓度反演误差关键因素及其影响机制。本项目的实施为探索湖泊水体光学研究理论、改进水色遥感算法提供重要依据和应用价值。

中文关键词： 遥感；鄱阳湖；非均匀；悬浮物；反射率

英文摘要： With the increasingly prominent of lake ecological environment, the study of high-precision quantitative remote sensing inversion for lake water color elements have important practical significance. Suspended sediments is the key element of the lake water color parameters, Water of inland lake is complex and Inconstant, vertical nonuniform water is widespread, Therefore the study of associating with water optical transfer problems of vertical nonuniform Suspended sediments and remote sensing accuracy is imminent. However, people are still less research on the optical properties of vertical nonuniform lake. This project Combines with optical deep water area of Poyang lake, we will monitor apparent optical properties and vertical inherent optical properties in different period of Poyang lake, and analyse spatial-temporal variability of different water vertical inherent optical properties, the study builds lake nonuniform water vertical structure parameterization model about optics properties. Simultaneously introduced into two-flow radiative transfer model, it is suitable for the establishment of a nonuniform water optical vertical model about lake, to obtain remote sensing reflectance and the vertical distribution reflectance of lake. It researches the remote sensing reflectance, key factors of suspended sediments concentration retrieval error and their mechanisms under vertical distribution about hydrodynamics, suspended sediments component, concentration, particle size, Implementation of this project is to provide an important basis and application value for exploring the theory of optical studies of lake water and improving water color remote sensing algorithms.

英文关键词： Remote Sensing;Poyang Lake;Vertical Nonuniformity;Suspended Sediments;Reflectance