无人机多光谱反射测量海岸带表层叶绿素-a浓度的制图

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2022-09-01 DOI:10.1016/j.jher.2022.08.003
S.N. Chan, Y.W. Fan , X.H. Yao
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引用次数: 2

摘要

在亚热带沿海水域,浮游植物在有利条件下的爆炸性生长可能导致水体变色和大量鱼类死亡。人工实地取样和实验室分析作为藻类生物量指标的叶绿素-a浓度(Chl-a)是资源密集型和耗时的,延迟了对灾难性有害藻华的反应。多云天气常常妨碍使用卫星图像监测水质和藻华。本研究旨在基于搭载五波段多光谱相机的无人机(UAV)表面反射率测量,开发一种用于沿海水域表面Chl-a定量制图的估计算法。表面反射率是由经过校准的多光谱图像获得的,这些图像是根据入射的太阳辐射进行辐射校正的。结果表明,Chl-a与归一化绿红差指数(NGRDI)呈负相关。建立了基于NGRDI的Chl-a回归估计模型,该模型对不同特征的沿海水域养鱼场具有良好的性能。该技术用于绘制藻华期间Chl-a的时空变化,为渔业管理和应急响应的传统现场监测提供了有益的补充。
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Mapping of coastal surface chlorophyll-a concentration by multispectral reflectance measurement from unmanned aerial vehicles

In subtropical coastal waters, the explosive growth of phytoplankton under favorable conditions can lead to water discolouration and massive fish kills. Manual field sampling and laboratory analysis of chlorophyll-a concentration (Chl-a) as an indicator to algal biomass, is resources intensive and time consuming, delaying responses to disastrous harmful algal blooms. Cloudy weather often precludes the use of satellite images for water quality and algal bloom monitoring. This study aims at developing an estimator algorithm for quantitative mapping of surface Chl-a for coastal waters, based on surface reflectance measurement from an Unmanned Aerial Vehicle (UAV) with a five-band multispectral camera. The surface reflectance is obtained from calibrated multispectral images which are radiometric-corrected against incoming solar radiation. It is found that Chl-a has an inverse correlation with the Normalized Green-Red Difference Index (NGRDI). A regression estimator model for Chl-a from NGRDI is developed, showing excellent performance for fish farms in coastal waters with different characteristics. The technology is demonstrated for mapping the spatial and temporal variation of Chl-a during an algal bloom, offering a useful complement to traditional field monitoring for fisheries management and emergency response.

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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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