围填海工程近岸水体叶绿素a浓度变化遥感监测分析

Remote Sensing Monitoring and Analysis of Chlorophyll-a Concentration Change in Coastal Waters of Reclamation Project

基于Landsat影像,建立三亚湾凤凰岛周围水体叶绿素a浓度数学回归模型,反演凤凰岛周围水体叶绿素a浓度,从时间和空间角度分析凤凰岛二期施工建设对水体叶绿素a浓度变化的影响。结果表明:三亚湾及凤凰岛附近水域叶绿素a浓度在逐年升高;2014年4月凤凰岛二期开始施工后,周围海域叶绿素a浓度上升速度加快,填海完成后这一影响会逐渐消失。靠近凤凰岛的海域比远离的海域叶绿素a浓度高,施工建设期间近岸水体叶绿素a浓度变化速率不同于远离人工岛的海域;离岸距离相同的情况下,紧邻凤凰岛的水体比远离凤凰岛的叶绿素a浓度高。这些现象反映了凤凰岛填海过程造成的一些影响会促使局部水域叶绿素a浓度快速增大,从而在一定程度上改变了近岸海洋水体生态环境。

Based on the Landsat image,a mathematical regression model of chlorophyll a concentration in the water around Phoenix Island in Sanya Bay was established to invert the concentration of chlorophyll a in the water around Phoenix Island.The influence of the construction of the second phase of Phoenix Island on the change of chlorophyll a concentration in water was analyzed from the perspective of time and space.The results showed that the concentration of chlorophyll a in the waters around Sanya Bay and Phoenix Island increased year by year.After the construction of the second phase of Phoenix Island in April 2014,the concentration of chlorophyll a in the surrounding sea area increased,and the effect gradually disappeared after the completion of reclamation.The concentration of chlorophyll a in the sea near Phoenix Island is higher than that in the far-off sea.The rate of change of chlorophyll a concentration in the nearshore water body during construction is different from that in the sea away from the artificial island.When the offshore distance is the same,the water body adjacent to Phoenix Island is farther away from Phoenix Island.The concentration of chlorophyll a is high.These phenomena reflect that some effects caused by the reclamation process of Phoenix Island will promote the rapid increase of chlorophyll a concentration in local waters,thus changing the ecological environment of coastal ocean waters to some extent.