title: Using MODIS data for mapping of water types within river plumes in the Great Barrier Reef, Australia: towards the production of river plume risk maps for reef and seagrass ecosystems.
abstract: River plumes are the major transport mechanism for nutrients, sediments and other land-based pollutants into the Great Barrier Reef (GBR, Australia) and are a major threat to coastal and marine ecosystems such as coral reefs and seagrass beds. Understanding the spatial extent, frequency of occurrence, loads and ecological impacts of land-based pollutants discharged through river plumes is essential to drive catchment management actions. In this study, a framework to produce river plume risk maps for seagrass and coral ecosystems, using supervised classification of MODIS Level 2 (L2) satellite products, is presented. Based on relevant L2 thresholds, river plumes are classified into Primary, Secondary, and Tertiary water types, which represent distinct water quality (WQ) parameters concentrations and combinations. Annual water type maps are produced over three wet seasons (2010-2013) as a case of study. These maps provide a synoptic basis to assess the likelihood and magnitude of the risk of reduced coastal WQ associated with the river discharge (river plume risk) and in combination with sound knowledge of the regional ecosystems can serve as the basis to assess potential ecological impacts for coastal and marine GBR ecosystems. The methods described herein provide relevant and easily reproducible large-scale information for river plume risk assessment and management.
authors.affiliation: Centre for Tropical Water and Aquatic Ecosystem Research, Catchment to Reef Research Group, James Cook University, Townsville, QLD 4811, Australia. Electronic address: caroline.petus@jcu.edu.au.
authors.forename: Caroline
authors.initials: C
authors.lastname: Petus
authors.affiliation: Centre for Tropical Water and Aquatic Ecosystem Research, Catchment to Reef Research Group, James Cook University, Townsville, QLD 4811, Australia.
authors.forename: Eduardo Teixeira
authors.initials: ET
authors.lastname: da Silva
authors.affiliation: Centre for Tropical Water and Aquatic Ecosystem Research, Catchment to Reef Research Group, James Cook University, Townsville, QLD 4811, Australia.
authors.forename: Michelle
authors.initials: M
authors.lastname: Devlin
authors.affiliation: Centre for Tropical Water and Aquatic Ecosystem Research, Catchment to Reef Research Group, James Cook University, Townsville, QLD 4811, Australia; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia.
authors.forename: Amelia S
authors.initials: AS
authors.lastname: Wenger
authors.affiliation: Centre for Tropical Water and Aquatic Ecosystem Research, Catchment to Reef Research Group, James Cook University, Townsville, QLD 4811, Australia; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia.
authors.forename: Jorge G
authors.initials: JG
authors.lastname: Alvarez-Romero
mesh_terms: D000818:Animals; D037421:Anthozoa; D001315:Australia; D057894:Coral Reefs; D017753:Ecosystem; D019684:Magnoliopsida; D012306:Risk; D045483:Rivers; D063809:Satellite Imagery; D014867:Water; D014874:Water Pollutants, Chemical; D060753:Water Quality
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water
keywords: Ecological impact; Great Barrier Reef; Monitoring; Risk maps; River plume; Water quality; Water types