摘要
The impacts of the Hong Kong-Zhuhai-Macao Bridge(HKZMB)on suspended sediment content(SSC)were analysed in the Zhujiang River Estuary based on data from HY-1C,which was launched in September 2018 in China,carrying Coastal Zone Imager(CZI)and Chinese Ocean Color and Temperature Scanner on it.A new SSC inversion model was established based on the relationship between in-situ SSC and the remote sensing reflectance in red and near-infrared bands of CZI image.HY-1C satellite data obtained from October to December 2019 were applied to retrieve SSC in the Zhujiang River Estuary.The results show that SSC around the HKZMB is ranging from 20 mg/L to 95 mg/L.SSC change obviously on two sides of the bridge.During flooding and ebbing period,SSC increases obviously downstream of the bridge.SSC difference between upstream and downstream is ranging from 5 mg/L to 20 mg/L.Currents flowing across the HKZMB,the change trend of SSC in most places upstream and downstream is almost the same that SSC downstream of the bridge is higher than SSC upstream.The tidal currents interact with bridge piers,inducing vortexes downstream,leading the sediment to re-suspend downstream of the bridge piers.Other factors,including seafloor topography and wind,can also contribute to the distribution of SSC in the Zhujiang River Estuary.
基金
The Zhejiang Key Science and Technology Project under contract No.2020C02004
the National Key Research and Development Program of China under contract Nos 2017YFA0604901 and 2017YFA0604902
the Basic Public Welfare Research Program of Zhejiang Province under contract No.LGF21D010004
the National Key Research and Development Program of China under contract No.2016YFC1401605
the National Natural Science Foundation of China under contract No.41776183
the Curriculum Ideological and Political Teaching Research Project in the Universities of Zhejiang Province(Grouped Ideological and Political Teaching Model Research in the Subject of Marine Remote Sensing)。
