Monitoring the Spatio-Temporal Distribution of Ulva prolifera in the Yellow Sea (2020–2022) Based on Satellite Remote Sensing

The green tide caused by Ulva prolifera (U. prolifera) is becoming more severe as climate change and human activity accelerate, endangering tourism, aquaculture, urban landscapes in coastal cities. In order to understand the spatio-temporal distribution of U. response disaster, this study used Haiyang-1C (HY-1C) satellite accompanied Sentinel-2 GaoFen-1 (GF-1) satellites systematically monitor between 2020 2022. consistency HY-1C satellites, well GF-1 was first investigated determination coefficients (R2) were 0.966 0.991, respectively, which supports feasibility China’s ocean water color operational satellite, HY-1C, for monitoring. Therefore, studied herein, along with influence range, area, drift paths. From 2022, appeared late May lasted 61, 88, 73 days. Additionally, area continuously decreased while it generally increased then 2021. It an interesting phenomenon that when maximum occurred at early stage both paths tended move southward after traveling northward. overall trend path 2021 head Thus, dynamic evolution, helpful promote systematic development emergency mechanisms prolifera.