Shandong Science ›› 2025, Vol. 38 ›› Issue (3): 25-33.doi: 10.3976/j.issn.1002-4026.2025036

• Ocean Remote Sensing • Previous Articles     Next Articles

Spatiotemporal variation in raft-based kelp aquaculture in Heiniwan Bay using a remote sensing and monitoring technique

LI Xin1(), HAO Zengzhou2,3,4,*(), LI Yunzhou3,4,5, HUANG Haiqing2,4, PAN Delu2,4   

  1. 1. School of Information Engineering, Zhejiang Ocean University, Zhoushan 316022, China
    2. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
    3. Institute of Marine Instrumentation, Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266061, China
    4. Shandong Provincial Academician Workstation, Shandong Academy of Sciences, Jinan 250014, China
    5. Laoshan Laboratory, Qingdao 266237, China
  • Received:2025-04-08 Online:2025-06-20 Published:2025-06-26
  • Contact: HAO Zengzhou E-mail:xin.lii@foxmail.com;hzyx80@sio.org.cn

Abstract:

Accurate assessment of the scale and distribution of offshore marine aquaculture is critical for effective management, spatial planning, and ecological protection. This study employed high-resolution Sentinel-2A/2B satellite imagery, a U-Net deep learning model for automatic feature extraction, and human-computer interactive correction to map the spatial extent of raft-based kelp farming in Heiniwan Bay from 2016 to 2024. The analysis revealed a three-phase development trajectory in the aquaculture area over the nine-year period. Spatial distribution exhibited a stable “north-south agglomeration with central sparsity” pattern. The observed spatiotemporal dynamics reflect the combined influence of technological advancements, policy interventions, and natural environmental conditions. These findings offer a robust scientific basis for optimizing aquaculture zoning, adaptive management strategies, and ecological governance in coastal regions with comparable aquaculture practices and environmental settings.

Key words: Sentinel-2A/2B, remote sensing, raft-based kelp aquaculture, deep learning, Heiniwan Bay, spatiotemporal evolution

CLC Number: 

  • TP79