Surf Zone Characterization Using a Small Quadcopter: Technical Issues and Procedures

Holman, Robert A.; Brodie, Katherine L.; Spore, Nicholas J.

doi:10.1109/tgrs.2016.2635120

Cited by 82 publications

(66 citation statements)

References 10 publications

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“…Due to the alternations of coarse and fine strata, groundwater flow occurs through separated subaquifers that possess different groundwater levels . In addition, preferential flow paths in the form of dissolution tubes and cavities develop due to dissolution of the evaporitic minerals (Magal et al, 2010;Ionescu et al, 2012). The dissolution process accelerates with the continuous and fast drop of the Dead Sea water level of ∼ 1 m yr −1 , which forces the formation of new groundwater flow paths.…”

Section: Hydrogeological Settingmentioning

confidence: 99%

“…At the investigation site, focused SGD occurrences were mapped in 2011 and 2012 by scuba divers and hydrochemically investigated. Based on their findings groundwater emerges from mature karst-like cavities down to depths of 30 m below the sea surface (Ionescu et al, 2012;Mallast et al, 2014). From these cavities groundwater emerges as focused SGD.…”

Section: Submarine Groundwater Discharge and Onshore Spring Charactermentioning

confidence: 99%

“…Apart from focused SGD, diffuse SGD occurs at the investigation site as well, either in various depths below the water surface (Ionescu et al, 2012) or at the shoreline. At the study area one diffuse SGD site exists directly at the shoreline (Fig.…”

Section: Submarine Groundwater Discharge and Onshore Spring Charactermentioning

confidence: 99%

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Combining continuous spatial and temporal scales for SGD investigations using UAV-based thermal infrared measurements

Mallast

Siebert

2019

Hydrol. Earth Syst. Sci.

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Section: Hydrogeological Settingmentioning

confidence: 99%

Section: Submarine Groundwater Discharge and Onshore Spring Charactermentioning

confidence: 99%

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Combining continuous spatial and temporal scales for SGD investigations using UAV-based thermal infrared measurements

Mallast

Siebert

2019

Hydrol. Earth Syst. Sci.

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“…At the time of writing, the latest new remote-sensing development at Narrabeen is the use of UAV quadcopter platforms to facilitate the collection of video timestacks, that are then analyzed by the cBathy technique [27] to estimate time-evolving surfzone bathymetry [107]. Complimenting the exiting Argus station located in the southern part of the embayment, these newly available remote-sensed data obtained by UAV quadcopters now enable surfzone morphology to be monitored and quantified at any location alongshore, irrespective of a suitable beach-front building or other elevated location for the mounting of cameras.…”

Section: Unmanned Aerial Vehiclesmentioning

confidence: 99%

Remote Sensing Is Changing Our View of the Coast: Insights from 40 Years of Monitoring at Narrabeen-Collaroy, Australia

2018

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Narrabeen-Collaroy Beach, located on the Northern Beaches of Sydney along the Pacific coast of southeast Australia, is one of the longest continuously monitored beaches in the world. This paper provides an overview of the evolution and international scientific impact of this long-term beach monitoring program, from its humble beginnings over 40 years ago using the rod and tape measure Emery field survey method; to today, where the application of remote sensing data collection including drones, satellites and crowd-sourced smartphone images, are now core aspects of this continuing and much expanded monitoring effort. Commenced in 1976, surveying at this beach for the first 30 years focused on in-situ methods, whereby the growing database of monthly beach profile surveys informed the coastal science community about fundamental processes such as beach state evolution and the role of cross-shore and alongshore sediment transport in embayment morphodynamics. In the mid-2000s, continuous (hourly) video-based monitoring was the first application of routine remote sensing at the site, providing much greater spatial and temporal resolution over the traditional monthly surveys. This implementation of video as the first of a now rapidly expanding range of remote sensing tools and techniques also facilitated much wider access by the international research community to the continuing data collection program at Narrabeen-Collaroy. In the past decade the video-based data streams have formed the basis of deeper understanding into storm to multi-year response of the shoreline to changing wave conditions and also contributed to progress in the understanding of estuary entrance dynamics. More recently, 'opportunistic' remote sensing platforms such as surf cameras and smartphones have also been used for image-based shoreline data collection. Commencing in 2011, a significant new focus for the Narrabeen-Collaroy monitoring program shifted to include airborne lidar (and later Unmanned Aerial Vehicles (UAVs)), in an enhanced effort to quantify the morphological impacts of individual storm events, understand key drivers of erosion, and the placing of these observations within their broader regional context. A fixed continuous scanning lidar installed in 2014 again improved the spatial and temporal resolution of the remote-sensed data collection, providing new insight into swash dynamics and the often-overlooked processes of post-storm beach recovery. The use of satellite data that is now readily available to all coastal researchers via Google Earth Engine continues to expand the routine data collection program and provide key insight into multi-decadal shoreline variability. As new and expanding remote sensing technologies continue to emerge, a key lesson from the long-term monitoring at Narrabeen-Collaroy is the importance of a regular re-evaluation of what data is most needed to progress the science.

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“…The intermediate beach states ( = 2-5) are characterized by rip current occurrence. In this paper we investigated the rip current spacing and morphology with numerical and experimental methods, including RPAS observations which have been already used for topographic mapping (Turner et al, 2016), and recently extended their applicability to the surf zone characterization (Holman et al, 2017). In order to establish a correlation between beach morphology and the rip current features, the fall velocity parameter was related to rip spacing in the coastal area at the Sele River mouth in the Gulf of Salerno, which was the subject of coastal vulnerability and risk evaluation Benassai et al, 2012aBenassai et al, , 2014 and coastal morphodynamics (Pennetta et al, 2011b).…”

Section: Introductionmentioning

confidence: 99%

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

Benassai

Aucelli

Budillon

et al. 2017

Nat. Hazards Earth Syst. Sci.

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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 RPAS (remotely piloted aircraft systems) observations, allowed us 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 analysis and a set of high-resolution wave numerical simulations, completed with Google Earth ™ images and RPAS observations. The grain size trend analysis and the numerical simulations allowed us to identify the rip current occurrence, forced by topographically constrained channels incised on the seabed, which were compared with observations.

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Surf Zone Characterization Using a Small Quadcopter: Technical Issues and Procedures

Cited by 82 publications

References 10 publications

Combining continuous spatial and temporal scales for SGD investigations using UAV-based thermal infrared measurements

Combining continuous spatial and temporal scales for SGD investigations using UAV-based thermal infrared measurements

Remote Sensing Is Changing Our View of the Coast: Insights from 40 Years of Monitoring at Narrabeen-Collaroy, Australia

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

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