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基于遥感反演的莱州湾水色变化的多时相分析
姜丽君1, 王庆1, 徐洋1, 战超1, 王红艳1, 刘亚龙2, 姜丽丽3
1.鲁东大学海岸研究所 烟台 264025;2.国家海洋局烟台海洋环境监测中心站 烟台 264006;3.烟台鲁达环境影响评价有限公司 烟台 264004
摘要:
悬浮泥沙和叶绿素是海洋水色的重要部分,是反映河口海岸地区生态环境状况的重要指标。本文基于Landsat TM/ETM+/OLI遥感影像,在不依赖地面实测数据的条件下,结合水文气象数据,利用光谱信息建立水色遥感模型对莱州湾1996—2015年不同时期的悬浮泥沙和叶绿素变化进行研究。研究结果表明:(1)此模型可以快速反演出较大空间尺度内的水色时空分布情况。(2)1996—2015年这一时期内悬浮泥沙浓度变化明显,枯水期的悬浮泥沙扩散范围总体大于丰水期,悬浮泥沙高浓度区主要分布在黄河口附近海域和沿岸区域,泥沙主要来源于陆源输沙和海水中的泥沙再悬浮,悬浮泥沙的扩散主要受潮流的影响,风和波浪等动力因素也在一定程度上影响着悬浮泥沙的扩散;(3)此外,莱州湾叶绿素高浓度区主要分布在莱州湾东—南部海域,其分布具有明显的季节性,春季(5月)海水温度升高,水中营养物质垂直混合好使得叶绿素浓度处于较高态势。
关键词:  莱州湾  水色遥感模型  悬浮泥沙  叶绿素
DOI:10.11693/hyhz20171200315
分类号:P731
基金项目:国家自然科学基金项目,U1706220号,41471005号,41271016号;国家重点研发计划项目,2017YFC0505902号。
MULTI-TEMPORAL ANALYSIS OF WATER COLOR VARIATION IN LAIZHOU BAY BASED ON REMOTE SENSING IMAGES
JIANG Li-Jun1, WANG Qing1, XU Yang1, ZHAN Chao1, WANG Hong-Yan1, LIU Ya-Long2, JIANG Li-Li3
1.Coast Institute, Ludong University, Yantai 264025, China;2.Yantai Marine Environment Monitoring Center Station, State Oceanic Administration, Yantai 264006, China;3.Yantai Luda Environmental Impact Assessment Co., Ltd., Yantai 264004, China
Abstract:
The change of ocean color is highly influenced by suspended sediment and chlorophyll levels which are essentially reflecting the ecological environment of estuarine and coastal areas. Combined with hydrological meteorological data, Water color remote sensing models were built based on Landsat TM/ETM+/OLI remote sensing images of Laizhou Bay during 1996 to 2015. According to the model inversion results, the suspended sediment concentration distribution changed obviously during the study period. The suspended sediment concentration in the dry season was higher than that in the wet season, and the zone of turbidity maximum is inferred in the Yellow River Estuary and near the southwest shore of the Laizhou Bay, the suspended sediment mainly originates from river discharge and resuspension. The diffusion of suspended sediment is mainly affected by the tidal flow field, and the dynamic factors such as wind and wave also affect the diffusion of suspended sediment. Chlorophyll concentration in some area increased significantly. The high concentration area of chlorophyll in Laizhou Bay is mainly distributed in the southeastern waters of Laizhou Bay, and its distribution is obvious seasonal. In spring (May), the temperature of seawater rises, and the vertical mixing of nutrients in water makes the chlorophyll concentration higher.
Key words:  Laizhou Bay  remote sensing algorithm  the suspended sediment  chlorophyll
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