Improved Detection of Tiny Macroalgae Patches in Korea Bay and Gyeonggi Bay by Modification of Floating Algae Index

Ahmed Harun-Al-Rashid,Chan-Su Yang

doi:10.3390/rs10091478

Abstract

This work focuses on the detection of tiny macroalgae patches in the eastern parts of the Yellow Sea (YS) using high-resolution Landsat-8 images from 2014 to 2017. In the comparison between floating algae index (FAI) and normalized difference vegetation index (NDVI) better detection by FAI was observed, but many tiny patches still remained undetected. By applying a modification on the FAI around 12% to 27% increased and correct detection of macroalgae is achieved from 35 images compared to the original. Through this method many scattered tiny patches were detected in June or July in Korea Bay and Gyeonggi Bay. Though it was a small-scale phenomenon they occurred in the similar period of macroalgal bloom occurrence in the YS. Thus, by using this modified method we could detect macroalgae in the study areas around one month earlier than the previously used Geostationary Ocean Color Imager NDVI-based detection. Later, more macroalgae patches including smaller ones occupying increased areas were detected. Thus, it seems that those macroalgae started growing locally from tiny patches rather than being transported from the western parts of the YS. Therefore, this modified FAI could be used for the precise detection of macroalgae.

Highlights

Vigorous proliferation of macroalgae is usually referred to as a macroalgal bloom (MAB) which generally occurs in the eutrophic waterbodies like bays, lakes, coastal waters, etc. [1,2]
The detection results of macroalgae by floating algae index (FAI) and mod-FAI of path/row 119/35 on 25 July 2015 are shown as Figure 3b,c, respectively, and the macroalgae detection in the respective area of Geostationary Ocean Color Imager (GOCI) based normalized difference vegetation index (NDVI) is shown as Figure 3a
In the NDVI image some macroalgae patches covering small areas are detected, whereas considerably more areas are detected as macroalgae in the high spatial resolution Landsat-8 based FAI image

Summary

Introduction

Vigorous proliferation of macroalgae is usually referred to as a macroalgal bloom (MAB) which generally occurs in the eutrophic waterbodies like bays, lakes, coastal waters, etc. [1,2]. Vigorous proliferation of macroalgae is usually referred to as a macroalgal bloom (MAB) which generally occurs in the eutrophic waterbodies like bays, lakes, coastal waters, etc. MAB was a common phenomenon in the YS, in 2008 it attracted mass public attention for the first time due to massive bloom and sudden beaching in huge amounts in the coastal regions of Qingdao, China [8]. Afterwards, it progressively recurred in the western YS and adjacent waters [9]

Methods

Results

Discussion

Conclusion