Journal of Geo-information Science ›› 2020, Vol. 22 ›› Issue (7): 1463-1475.doi: 10.12082/dqxxkx.2020.190677

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Remote Sensing Monitoring and Variation Analysis of Marine Ecological Environment in Coastal Waters of Sri Lanka

YE Huping1,3,5(), LIAO Xiaohan1,3,4,*(), HE Xianqiang2, YUE Huanyin1,3,4   

  1. 1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    2. State Key Laboratory of Satellite Ocean Environment Dynamics, the Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;
    3. Institute of UAV Application Research, Tianjin and CAS, Tianjin 301800, China;
    4. The Research Center for UAV Applications and Regulation, Chinese Academy of Sciences, Beijing 1000101, China;
    5. China-Sri Lanka Joint Research and Demonstration Center for Water Technology, Chinese Academy of Sciences, Beijing 100085, China
  • Received:2019-11-11 Revised:2020-04-24 Online:2020-07-25 Published:2020-09-25
  • Contact: LIAO Xiaohan E-mail:yehp@igsnrr.ac.cn;liaoxh@igsnrr.ac.cn
  • Supported by:
    Strategic Priority Research Program of Chinese Academy of Sciences(XDA2003030201);National Natural Science Foundation of China(41771388);National Natural Science Foundation of China(41971359);Tianjin Intelligent Manufacturing Project: Technology of Intelligent Networking by Autonomous Control UAVs for Observation and Application

Abstract:

:Sri Lanka is an important node country along China's Maritime Silk Road. The changes in the ecological environment of its surrounding sea areas are closely related to its economic development, leisure life and dietary safety. This study analyzed Sri Lanka's surrounding waters and Colombo as a key node port from 2002 to 2017 using MODIS remote sensing products to characterize the interannual variations of ecological environment parameters. The MERIS remote sensing reflectance products were used to analyze the spatial and temporal characteristics of water bodies in the Palk Strait (2003-2012). Conclusions can be made as the following statements: (1) Within the study area, photosynthetically active radiation was observed higher value in Gulf of Mannar. The biomass of phytoplankton is relatively high in the coastal areas and inversely related to the sea surface temperature, while that in the open sea is extremely low and inversely related to seawater transparency.(2) In Colombo Port, the maximum values month of sea surface temperature, light intensity (photosynthetically active radiation), water cleanliness (seawater transparency), phytoplankton biomass and net primary phytoplankton productivity appear in April, March, March, August and July respectively, and the red tide, as a potential disaster causing factor, needs to be concerned in August.(3) The sources of the turbidity zone in the Palk Strait were the large amounts of sediment carried by the Cauvery River from Calimere cape of India. The distribution characteristics and long-term changing trends were analyzed, which provided a better understanding of the high temporal and spatial variations in the marine ecological environment of the Palk Strait and the surrounding waters of Sri Lanka in different time and space.

Key words: Sri Lanka, China's Maritime Silk Road, marine ecological environment, remote sensing monitoring, Colombo, Palk Strait, water type, spatial-temporal variation