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引用本文:李海军,陈晓玲,陆建忠,张鹏,齐亨达,陈莉琼.考虑采砂影响的鄱阳湖丰水期悬浮泥沙浓度模拟.湖泊科学,2016,28(2):421-431. DOI:10.18307/2016.0223
LI Haijun,CHEN Xiaoling,LU Jianzhong,ZHANG Peng,QI Hengda,CHEN Liqiong.Numerical simulation of suspended sediment concentration in Lake Poyang during flood season considering dredging activities. J. Lake Sci.2016,28(2):421-431. DOI:10.18307/2016.0223
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考虑采砂影响的鄱阳湖丰水期悬浮泥沙浓度模拟
李海军1, 陈晓玲1,2,3, 陆建忠1, 张鹏4, 齐亨达1, 陈莉琼1
1.武汉大学测绘遥感信息工程国家重点实验室, 武汉 430079;2.地球空间信息技术协同创新中心, 武汉 430079;3.江西师范大学鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022;4.水利部中国科学院水工程生态研究所, 水利部水工程生态效应与生态修复重点实验室, 武汉 430079
摘要:
针对受采砂活动影响显著的鄱阳湖高浑浊水体,结合数值模拟和遥感技术,利用已有的鄱阳湖采砂区遥感监测结果,在构建的鄱阳湖水动力-悬浮泥沙输移模型中添加泥沙点源,对2011年7月1-31日采砂影响下的鄱阳湖丰水期悬浮泥沙浓度进行数值模拟. 利用悬浮泥沙浓度实测数据和MODIS影像反演结果对模拟结果的有效验证表明,考虑采砂影响后,悬浮泥沙浓度模拟值与实测值具有强相关关系,确定性系数为0.831,均方根误差为15.5 mg/L,悬浮泥沙浓度空间分布趋势与遥感反演结果基本一致. 模拟结果显示,采砂活动对鄱阳湖南部主湖区、河流入湖口影响较小,其主要影响由南向北,经棠荫以西和松门山岛以北航道、入江水道延伸到湖口区域,是鄱阳湖北湖区高浑浊水体形成的重要原因.
关键词:  数值模拟  悬浮泥沙  遥感  Delft3D  鄱阳湖
DOI:10.18307/2016.0223
分类号:
基金项目:国家自然科学基金项目(41331174,41101415,41301366)、湖北省自然科学基金项目(2015CFB331)、江西省重大生态安全问题监控协同创新中心专项(JXS-EW-08)、测绘地理信息公益性行业科研专项(201512026)和国家科技支撑计划项目(2012BAC06B04)联合资助.
Numerical simulation of suspended sediment concentration in Lake Poyang during flood season considering dredging activities
LI Haijun1, CHEN Xiaoling1,2,3, LU Jianzhong1, ZHANG Peng4, QI Hengda1, CHEN Liqiong1
1.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, P. R. China;2.Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, P. R. China;3.Key Laboratory of Lake Poyang Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, P. R. China;4.Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resource, Institute of Hydroecology, Ministry of Water Resource and Chinese Academy of Science, Wuhan 430079, P. R. China
Abstract:
Numerical simulation and remote sensing are used in suspended sediment concentration simulation during flood season in Lake Poyang, in which water turbidity is highly affected by dredging activities. With the aid of Landsat ETM+ images, the location of main dredging areas and ships are detected. Several sediment point sources are added in dredging areas in the Delft3D model to simulate the suspended sediment concentration including the effects of dredging of Lake Poyang from July 1, 2011 to July 31, 2011. Taking in-situ data and suspended sediment concentration retrieved from MODIS images as validation data, there is a good consistence between the simulating and validating results, with R2 of 0.831, a root-mean-square error of 15.5 mg/L and a consistent spatial pattern of suspended sediment concentration compared with suspended sediment concentration retrieved from MODIS images. It also shows less dredging effects in the southern main lake and river inlets but more in the northern from channel in the west of Tangyin and the north of Songmen Mountain, water-way in the northern and the lake outlet, which is one of the main reasons causing high turbidity water in Lake Poyang. This study shows that by making good use of in-situ data and satellite remote sensing images, the precision of numerical simulation of suspended sediment concentration can be increased by considering the effect of human dredging activities, thus provided a good method for human affected water environment simulations of lakes.
Key words:  Numerical simulation  suspended sediment concentration  remote sensing  Delft3D  Lake Poyang
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