Topic
Groyne
About: Groyne is a research topic. Over the lifetime, 397 publications have been published within this topic receiving 4549 citations. The topic is also known as: groin & Breakwater.
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TL;DR: In this paper, hydraulic experiments were conducted in fixed and movable beds to examine the flow pattern, bed change and scour depth and hole around a groyne, and the results of the fixed-bed experiment indicated an effect on the flow change in the main channels and recirculation zones following the installation of a Groyne.
Abstract: Scour holes resulting from the installation of a groyne are considered to perform the environmental function of providing a habitat and a haven for various aquatic organisms during floods, hence, the need for studies on the scour area and its volume near a groyne beyond the scope of past discussions on their stability In this study, hydraulic experiments were conducted in fixed and movable beds to examine the flow pattern, bed change and scour depth and hole around a groyne The results of the fixed-bed experiment indicated an effect on the flow change in the main channels and recirculation zones following the installation of a groyne Changes in tip velocity and flow angle as the scour factors around a groyne were quantitatively compared as well Through the movable-bed experiment, the scour-hole shape, scour area, scour depth and volume of bed change were examined and compared
16 citations
Proceedings Article•
01 Jan 2012TL;DR: In response to the increasing occurrences of beach erosion along Surfers Paradise and Main Beaches - Gold Coast, Australia, the Northern Gold Coast Beach Protection Strategy [NGCBPS] was developed to widen the beach by 20-30m as well as improving surfing conditions as a secondary objective.
Abstract: In response to the increasing occurrences of beach erosion along Surfers Paradise and Main Beaches - Gold Coast, Australia, the Northern Gold Coast Beach Protection Strategy [NGCBPS] was developed to widen the beach by 20- 30m as well as improving surfing conditions as a secondary objective. The strategy, implemented in 1999- 2000, involved large-scale beach nourishment and construction of a submerged breakwater "reef" to act as a control point at Narrowneck. Construction of the reef involved innovative filling and placement methods using very large sand filled geotextile containers coupled with significant advances with regards to design of the geotextile material and containers. In the 11 years since construction, there has been substantial monitoring of the project since its completion in late 2000 including: - video imaging using webcams; hydrographic and beach surveys; aerial and oblique photography; surf and surf safety observations and GPS surfing track plots; and geotextile container condition and stability. This paper presents an update on the performance of the reef over the last four years. In particular, the response of the structure and the shoreline to a series of major storm events in 2009 has been examined. The results have shown that the erosion caused by these major events was accommodated within the wider beach created in 1999. Over the next 2 years there was a gradual recovery in the lee of the reef with a subtle groyne effect resulting in an even larger increase in the width of the updrift beach. A detailed underwater condition survey was also undertaken in 2011, to determine changes in the condition of the geotextile containers. This revealed a number of containers missing or damaged, and that seaward containers were covered by sand. The marine habitat which has been a feature of the reef has been impacted by the increased coverage of sand, but still shows high abundance and biodiversity.
16 citations
TL;DR: In this paper, the authors focused on a coastal stretch situated on the southern sector of the SW coast of India, where Sundar and Sannasiraj (2006) proposed a groyne field along with an existing seawall to control severe erosion.
16 citations
14 Dec 2012
TL;DR: In response to the increasing occurrences of beach erosion along Surfers Paradise and Main Beaches - Gold Coast, Australia, the Northern Gold Coast Beach Protection Strategy [NGCBPS] was developed to widen the beach by 20-30m as well as improving surfing conditions as a secondary objective as discussed by the authors.
Abstract: In response to the increasing occurrences of beach erosion along Surfers Paradise and Main Beaches - Gold Coast, Australia, the Northern Gold Coast Beach Protection Strategy [NGCBPS] was developed to widen the beach by 20-30m as well as improving surfing conditions as a secondary objective The strategy, implemented in 1999- 2000, involved large-scale beach nourishment and construction of a submerged breakwater “reef” to act as a control point at Narrowneck Construction of the reef involved innovative filling and placement methods using very large sand filled geotextile containers coupled with significant advances with regards to design of the geotextile material and containers In the 11 years since construction, there has been substantial monitoring of the project since its completion in late 2000 including: - video imaging using webcams; hydrographic and beach surveys; aerial and oblique photography; surf and surf safety observations and GPS surfing track plots; and geotextile container condition and stability This paper presents an update on the performance of the reef over the last four years In particular, the response of the structure and the shoreline to a series of major storm events in 2009 has been examined The results have shown that the erosion caused by these major events was accommodated within the wider beach created in 1999 Over the next 2 years there was a gradual recovery in the lee of the reef with a subtle groyne effect resulting in an even larger increase in the width of the updrift beach A detailed underwater condition survey was also undertaken in 2011, to determine changes in the condition of the geotextile containers This revealed a number of containers missing or damaged, and that seaward containers were covered by sand The marine habitat which has been a feature of the reef has been impacted by the increased coverage of sand, but still shows high abundance and biodiversity
16 citations
TL;DR: In this article, the results of field experiments in a natural river comprising large-scale groyne models populated with rigid and flexible artificial vegetation were reported, showing that vegetation rearranges twin-circulation flow into slow backwater flow.
Abstract: Flow recirculation in groyne fields promotes accumulation of fine sediments and development of riparian and aquatic vegetation. Although flow hydrodynamics in groyne fields is subject of intensive ongoing research, knowledge of vegetation effects on recirculating flow remains lacking. This paper reports the results of field experiments in a natural river comprising large-scale groyne models populated with rigid and flexible artificial vegetation. In the experimental runs population density, submergence ratios, and vegetation types were varied. The results show that vegetation rearranges twin-circulation flow into slow backwater flow. The magnitude of backwater flow is controlled by the bio-mechanical properties of vegetation. The hydrodynamics of the flow interface between the main river and groyne fields was only slightly altered by vegetation. Analytical models of flow at the interface and inside vegetated areas agree well with these experimental results.
15 citations