Multidecadal analysis of beach loss at the major offshore sea turtle nesting islands in the northern Arabian Gulf

Rommel H. Maneja; Jeffrey D. Miller; Wenzhao Li; Rejoice Thomas; Hesham El-Askary; Sachi Perera; Ace Vincent B. Flandez; Abdullajid U. Basali; Joselito Francis A. Alcaria; Jinoy Gopalan; Surya Tiwari; Mubarak Al-Jedani; Perdana K. Prihartato; Ronald A. Loughland; Ali Qasem; Mohamed A. Qurban; Wail Falath; Daniele Struppa

Ecological Indicators (Feb 2021)

Multidecadal analysis of beach loss at the major offshore sea turtle nesting islands in the northern Arabian Gulf

Rommel H. Maneja,
Jeffrey D. Miller,
Wenzhao Li,
Rejoice Thomas,
Hesham El-Askary,
Sachi Perera,
Ace Vincent B. Flandez,
Abdullajid U. Basali,
Joselito Francis A. Alcaria,
Jinoy Gopalan,
Surya Tiwari,
Mubarak Al-Jedani,
Perdana K. Prihartato,
Ronald A. Loughland,
Ali Qasem,
Mohamed A. Qurban,
Wail Falath,
Daniele Struppa

Affiliations

Rommel H. Maneja: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Jeffrey D. Miller: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Wenzhao Li: Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA
Rejoice Thomas: Computational and Data Sciences Graduate Program, Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA
Hesham El-Askary: Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA; Center of Excellence in Earth Systems Modeling & Observations, Chapman University, Orange, CA 92866, USA; Department of Environmental Sciences, Faculty of Science, Alexandria University, Moharem Bek, Alexandria 21522, Egypt; Corresponding author at: Schmid College of Science and Technology, Chapman University, 1 University Drive, Orange CA 92866, USA.
Sachi Perera: Computational and Data Sciences Graduate Program, Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA
Ace Vincent B. Flandez: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Abdullajid U. Basali: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Joselito Francis A. Alcaria: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Jinoy Gopalan: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Surya Tiwari: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Mubarak Al-Jedani: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Perdana K. Prihartato: Environmental Protection Department, Saudi Aramco, Dhahran, Saudi Arabia
Ronald A. Loughland: Environmental Protection Department, Saudi Aramco, Dhahran, Saudi Arabia
Ali Qasem: Environmental Protection Department, Saudi Aramco, Dhahran, Saudi Arabia
Mohamed A. Qurban: Ministry of Environment, Water and Agriculture, Saudi Arabia
Wail Falath: Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia; Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
Daniele Struppa: Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA

Journal volume & issue: Vol. 121
p. 107146

Abstract

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Undocumented historical losses of sea turtle nesting beaches worldwide could overestimate the successes of conservation measures and misrepresent the actual status of the sea turtle population. In addition, the suitability of many sea turtle nesting sites continues to decline even without in-depth scientific studies of the extent of losses and impacts to the population. In this study, multidecadal changes in the outlines and area of Jana and Karan islands, major sea turtle nesting sites in the Arabian Gulf, were compared using available Kodak aerographic images, USGS EROS Declassified satellite imagery, and ESRI satellite images. A decrease of 5.1% and 1.7% of the area of Jana and Karan islands, respectively, were observed between 1965 and 2017. This translated to 14,146 m2 of beach loss at Jana Is. and 16,376 m2 of beach loss at Karan Is. There was an increase of island extent for Karan Is. from 1965 to 1968 by 9098 m2 but comparing 2017 with 1968, Karan Is. lost as much as 25,474 m2 or 2.6% of the island extent in 1968. The decrease in island aerial extent was attributed to loss of beach sand. The southern tips of the island lost the most significant amount of sand. There was also thinning of beach sand along the middle and northern sections that exposed the rock outcrops underneath the beach. The process of beach changes of both islands was tracked by the satellite imagery from Landsat 1,3,5,7 and Sentinel-2 during 1972 to 2020. Other factors including the distribution of beach slope, sea level changes, as well as wind & current from both northward and eastward components were analyzed to show its impact on the beach changes. The loss of beach sand could potentially impact the quality and availability of nesting beach for sea turtles utilizing the islands as main nesting grounds. Drivers of beach loss at the offshore islands are discussed in the context of sea level rise, dust storms, extreme wave heights and island desertification.

Published in Ecological Indicators

ISSN: 1470-160X (Print); 1872-7034 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Biology (General): Ecology
Website: https://www.sciencedirect.com/journal/ecological-indicators

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