Rip current hazard at coastal recreational beaches in China

2021 ◽  
Vol 210 ◽  
pp. 105734
Author(s):  
Yao Zhang ◽  
Wanru Huang ◽  
Xunan Liu ◽  
Chi Zhang ◽  
Guodong Xu ◽  
...  
Keyword(s):  
Rip Current ◽  
Recreational Beaches

scholarly journals Rip current occurrence probability at selected recreational beaches along Pahang coastline

2020 ◽  
Vol 1 (1) ◽  
pp. 37-50
Author(s):  
Muhammad Amirul Syafiq Hamsan ◽  
Muhammad Zahir Ramli
Keyword(s):  
High Risk ◽  
Low Risk ◽  
Tidal Range ◽  
Rip Current ◽  
Rip Currents ◽  
Fall Velocity ◽  
Sediment Grain Size ◽  
Content Type ◽  
Near Drowning ◽  
Recreational Beaches

Purpose Pahang beaches draw more than thousand visitors throughout the year. From the year 2006 to 2018, more than 30 drowning and near-drowning cases were recorded mainly from rip currents. Rip currents are defined as unexpected currents that carried beachgoers away to seaward direction more than approximately 50 m from shore. The prediction of rip current development is very important for the protection of human life. This study aims to conduct preliminary survey and field works to identify rip current hazards. Design/methodology/approach The output would be an early warning preventative mitigation to public in Pahang. Beach state model, dimensionless fall velocity, littoral environment observation and relative tidal range were recorded for five recreational beaches during two different months (March and April 2018). The morphodynamic parameters such sediment fall velocity, sediment grain size and beach slope are then analysed using software PROFILER. Classification of risks was done based on beach morphodynamic model. The morphodynamics are classified as low tide bar rip, barred and low tide terrace associated with rip current, bar dissipative, reflective, non-bar dissipative, low tide terrace and ultra-dissipative. Findings Result shows three out of five recreational beaches may develop high-risk rip currents. During the first month of the survey, Batu Hitam (BH) was recorded the only one recreational beach that may develop high-risk rip current followed by Teluk Cempedak (TC) and Kempadang (KEM) as middle-risk rip current beaches, while Balok (BA) and Sepat (SEP) as low-risk rip current beaches. Different during second month of the survey, BA, BH and SEP were recorded as high-risk rip current beaches while TC and KEM as low-risk rip current beaches. Originality/value The results are consistent with beach incidents (drowning and near-drowning) reported.

THE IMPROVEMENT OF RISK MANAGEMENT AWARENESS BY VISUALIZED RIP CURRENT AMONG BEACH USERS

2019 ◽  
Vol 75 (2) ◽  
pp. I_701-I_706
Author(s):  
Shintaro ENDO ◽  
Haruka SHIMOIDA ◽  
Toshinori ISHIKAWA ◽  
Tsutomu KOMINE
Keyword(s):  
Risk Management ◽  
Rip Current

Rip Current Research Using a CCTV Image Analysis Including Swimmer Detecting Techniques at Haeundae Beach, Korea

2014 ◽  
Vol 72 ◽  
pp. 33-38 ◽  
Author(s):  
Jin Sang Hwang ◽  
Hong Sik Yun ◽  
Yong Cheol Suh ◽  
Jooyong Lee ◽  
Seong Chan Kang
Keyword(s):  
Image Analysis ◽  
Rip Current

Rip current rescues on unguarded beaches

Shore & Beach ◽  
2021 ◽  
pp. 41-45
Author(s):  
Aubrey Litzinger ◽  
Stephen Leatherman
Keyword(s):  
Young Person ◽  
Red Cross ◽  
Rip Current ◽  
Rip Currents ◽  
Water Ring ◽  
The U.S

Rip currents are the greatest danger at surf beaches. Professional lifeguards rescue tens of thousands of people every year at U.S. beaches, but only a small percentage of the nation’s beaches are guarded. Oftentimes it is a young person who is caught in a rip current, and a bystander will attempt a rescue without a flotation device. The U.S. Lifesaving Association strongly suggests that this kind of rescue should not be undertaken because too often the rescuer will drown. Some coastal towns such as Cocoa Beach in Florida are now posting ring buoys on their unguarded beaches with the warning to throw, but not to go into the water. Ring buoys of two different weights were tested for efficiency when thrown in terms of distance and accuracy. The participants threw the ring buoys two different ways: one way of their choosing (un-instructed) and second by Red Cross recommendation (instructed). The buoyancy was also tested for each buoy. While these flotation devices have some merit, they clearly have limitations.

Controls on Flash Rip Current Hazard on Low-Tide Terraced Tropical Beaches in West Africa

2018 ◽  
Vol 81 (sp1) ◽  
pp. 92 ◽  
Author(s):  
Bruno Castelle ◽  
Tim Scott ◽  
Rafael Almar ◽  
Nadia Senechal
Keyword(s):  
West Africa ◽  
Rip Current

scholarly journals Rip current evidence by hydrodynamic simulations, bathymetric surveys and UAV observation

2017 ◽  
Author(s):  
Guido Benassai ◽  
Pietro Aucelli ◽  
Giorgio Budillon ◽  
Massimo De Stefano ◽  
Diana Di Luccio ◽  
...  
Keyword(s):  
Grain Size ◽  
High Resolution ◽  
Numerical Simulations ◽  
Current System ◽  
Current Evidence ◽  
Rip Current ◽  
Rip Currents ◽  
Transport Pathways ◽  
Fine Sediments ◽  
Scientific Challenge

Abstract. The prediction of the formation, spacing and location of rip currents is a scientific challenge that can be achieved by means of different complementary methods. In this paper the analysis of numerical and experimental data, including UAV observation, allowed to detect the presence of rip currents and rip channels at the mouth of Sele river, in the Gulf of Salerno, southern Italy. The dataset used to analyze these phenomena consisted of two different bathymetric surveys, a detailed sediment 5 analysis and a set of high-resolution wave numerical simulations, completed with satellite and UAV observation. The grain size trend analysis and the numerical simulations allowed to identify the rip current system, forced by topographically constrained channels incised on the seabed, which were detected by high resolution bathymetric surveys. The study evidenced that on the coastal area of the Sele mouth grain-size trends are controlled by the contribution of fine sediments, which exhibit suspended transport pathways due to rip currents and longshore currents. The results obtained were confirmed by satellite and UAV 10 observations in different years.

Temporal variability of enterococci and associated sources at three subtropical recreational beaches

2018 ◽  
Vol 47 (4) ◽  
pp. 327-336
Author(s):  
Claudia Esmeralda León-López ◽  
José Alfredo Arreola-Lizárraga ◽  
Gustavo Padilla-Arredondo ◽  
Jorge Eduardo Chávez-Villalba ◽  
Renato Arturo Mendoza-Salgado ◽  
...  
Keyword(s):  
Public Health ◽  
Water Temperature ◽  
Health Risks ◽  
Temporal Variability ◽  
Rainfall Runoff ◽  
Public Health Risks ◽  
Recreational Beaches ◽  
Semi Arid

Abstract We have examined enterococci concentrations in water and sand (dry and wet) at three semi-arid subtropical recreational beaches to assess public health risks. To determine the concentration of enterococci, water and sand samples were collected before, during and after the Easter Week (when the largest influx of users occurs), and in the wintertime. The lowest concentrations (< 100 MPN 100 ml-1) were recorded before the Easter Week, the highest concentrations (> 1500 MPN 100 ml-1) during and after the Easter Week, and concentrations < 500 MPN 100 ml-1 in the wintertime. Enterococci concentrations in sand were generally < 200 MPN 100 ml-1. Variability in enterococci concentrations can be explained by the influx of users during the Easter Week, rainfall runoff and the increase in water temperature after the Easter Week, as well as by winds and the presence of dogs and birds in the wintertime. The highest health risks occur during and after the Easter Week.

Do temporary beach closures assist in the conservation of breeding shorebirds on recreational beaches?

2012 ◽  
Vol 18 (1) ◽  
pp. 47 ◽  
Author(s):  
Michael A Weston ◽  
Fiona Dodge ◽  
Ashley Bunce ◽  
Dale G Nimmo ◽  
Kelly K Miller
Keyword(s):  
Young People ◽  
Older People ◽  
High Density ◽  
Human Behaviour ◽  
Exclusion Zone ◽  
Promising Technique ◽  
Recreational Beaches ◽  
Beach Closures ◽  
Recreational Use ◽  
Probability Of Compliance

Recreational use of beaches may threaten some beach-nesting shorebirds in southern Australia. Temporary Beach Closures, comprized of a 50 x 25 m exclusion zone around a shorebird nest, represent a promising technique for altering human behaviour by reducing both disturbance to birds and inadvertent crushing of eggs by beach visitors. We assessed whether three commonly employed configurations of Temporary Beach Closures (sign, fence, and warden) were effective at: (1) achieving compliance among beach visitors, and (2) reducing egg-crushing rates. Overall, 93.7% of beach visitors complied with all Temporary Beach Closures, resulting in a reduction in egg-crushing rates within, as opposed to adjacent to, Temporary Beach Closures. Levels of compliance were high in all Temporary Beach Closure configurations (88.0–99.4%), and similar levels of compliance were achieved within the three configurations. Human compliance was highest for females and when the density of beach-users was higher, while individuals aged <20 and >61 years were less likely to comply with Temporary Beach Closures. Despite an increased probability of compliance on high density beaches, this did not translate into a reduction in egg crushing rates on such beaches, because the overall number of noncompliant individuals remained higher. We conclude any Temporary Beach Closure configuration is meritorious, and that their use on high and low-use recreational beaches will benefit breeding shorebirds by reducing the rate of egg-crushing. Targeting demographics that display lower levels of compliance, such as men, young people (i.e. <21), and older people (i.e. >60), may further improve the effectiveness of Temporary Beach Closures in enhancing the conservation of shorebirds.

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