Combining airborne and terrestrial laser scanning to monitor coastal processes

Julge, Kalev; Eelsalu, Maris; Grünthal, Erkko; Talvik, Silja; Ellmann, Artu; Soomere, Tarmo; Tõnisson, Hannes

doi:10.1109/baltic.2014.6887874

Cited by 11 publications

(25 citation statements)

References 18 publications

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“…Such beaches evolve in a step-like manner: slow evolution is interspersed with rare but rapid events. As spatial resolution of standard profiling of beaches is often not sufficient to resolve their slow changes, we employ a combination of terrestrial (TLS) and airborne (ALS) laser scanning techniques [19] and an application of the inverse Bruun Rule [18] to characterise and quantify the changes during the slow evolution of the accumulation area.…”

Section: Intensity Of Accretion In the Study Areamentioning

confidence: 99%

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Preventive management of undesired changes in alongshore sediment transport in the planning of a waterfront infrastructure

Käärd¹,

Valdmann²,

Eelsalu³

et al. 2016

WIT Transactions on Ecology and the Environment

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We show that undesired remote impacts of changes in the location of the waterfront may occur in fairly mild wave conditions. As an example, we analyse the consequences of a moderate reclamation action in the bayhead of Tallinn Bay, the Baltic Sea. The planned changes are fairly small: the waterfront will be shifted by a few tens of metres owing to the construction of a new major traffic junction. The potential impacts are established using generic concepts of the nature of coastal processes and a detailed reconstruction of the local wave climate. The main properties of closure depths and magnitude and direction of wave-driven alongshore transport in the entire bay are established using a triplenested high-resolution version of the wave model WAM that is forced for 32 years by high-quality marine winds. It is demonstrated that the planned reclamation area currently serves as a convergence point of alongshore sediment transport. Even though the closure depth is only about 2 m, the presence of fine sand gives rise to a relatively wide equilibrium beach profile. The seaward end of this profile is currently close to the entrance to a major harbour about 0.5 km from the activity area. The pattern of sediment motions is such that even a minor shift in the coastline may lead to considerable increase in the transport of sand into the harbour entrance. We evaluate the time scale for this process based on laser scanning data about sand accumulation rates and the concept of equilibrium beach profile, and discuss the ways of preventive mitigation of the consequences of reclamation.

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Section: Intensity Of Accretion In the Study Areamentioning

confidence: 99%

“…The data set used in this study consists of both ALS and TLS data that are described in more detail in [19]. The ALS data were gathered using a Leica ALS50-II airborne laser scanner and pre-processed (the ground filtering and classification of the measured points) by the Estonian Land Board.…”

Section: Intensity Of Accretion In the Study Areamentioning

confidence: 99%

Preventive management of undesired changes in alongshore sediment transport in the planning of a waterfront infrastructure

Käärd¹,

Valdmann²,

Eelsalu³

et al. 2016

WIT Transactions on Ecology and the Environment

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“…Combining of ALS and TLS was used for monitoring of beach segment of the Pirita Beach (Tallinn Bay) (Julge et al 2014). ALS flights, conducted in different altitudes and seasons, yield sub-decimetre accuracy for detecting contemporary coastal processes of Tallinn Bay (Grünthal et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Coastal dynamics of the eastern Gulf of Finland, the Baltic Sea: toward a quantitative assessment

Sergeev¹,

Ryabchuk²,

Zhamoida³

et al. 2018

Baltica

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The easternmost part of the Gulf of Finland is characterized by intense coastal processes dominated by wave erosion. Reliable prediction of the coastal zone development, as well as effective strategy for coastal protection, demands a quantitative assessment of beach transformation and volume of sediment loss as a result of extreme storms. The main goal of this study based on results of terrestrial laser scanning was to establish volumes of eroded, transported, and redeposited sand during storm surge events that occurred between 2012 and 2017, and to verify a mathematical model of beach profile changes within key areas located in the Kurortny District of St. Petersburg (Gulf of Finland, Baltic Sea), where the longest set of levelling and terrestrial laser scanning was conducted. The resulting detailed 3D GIS models of coastal relief, based on high-resolution geodesic surveys, produced a highly reliable database of beachface transformation under the extreme storm impact and quantitative assessment of erosion volumes and sediment loss.

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“…During the last decade, the measurement methods based on Light Detection and Ranging (LiDAR) technology were developed and popularized [Bremer, Sass, 2012;Cebulski, 2014;Day et al, 2013aDay et al, , 2013bJaboyedoff et al, 2009;Julge et al, 2014;Kociuba, 2017;Milan et al, 2007;Telling et al, 2017], making it possible to generate and analyse high-resolution digital elevation models (HRDEM). The use of airborne laser scanning (ALS) allows researchers to study large areas but it has its limits, especially when surveying vertical or near-vertical structures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of River Bank Erosion by Combined Airborne and Long-Range Terrestrial Laser Scanning: Preliminary Results on the Vistula River

Тышковский¹,

Качмарек²,

Линовский³

et al. 2018

Geodin. tektonofiz.

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In our study, high-resolution digital elevation models (HRDEM) were generated by combining the data from airborne laser scanning (ALS, 2012) and long-range terrestrial laser scanning (TLS, 2015) and used for qualitative and quantitative analysis of recent morphodynamic processes in the Vistula river bed near Nieszawa, Central Poland. The study area was a river stretch nearly 1 km long, in its lowland part, with the 440 m wide channel and 3.5-5.0 m high banks. It is located 27 km downstream from the reservoir in Włocławek, so it is under the influence of the reservoir. The TLS measurements were performed from the opposite bank of the river, from a distance of up to 750 m. By combining the ALS and TLS data, we investigated and evaluated both the horizontal variations in the height of the river bank and changes in its profile, with a high resolution of about 900 points/m 2. Our results show that in this river stretch, both the transverse profile of the river bank and the location of its upper edge have been changed during the three years between the ALS and TLS measurement sessions. The scale of this phenomenon varies from a complete lack of erosion to lowering of the upper edge of the cliff by about 1 m, in some points even up to 2 m. The applied methods allowed us to estimate the area of the observed transformations, in contrast to the conventional methods that enable only analyses in selected transverse sections.

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Combining airborne and terrestrial laser scanning to monitor coastal processes

Cited by 11 publications

References 18 publications

Preventive management of undesired changes in alongshore sediment transport in the planning of a waterfront infrastructure

Preventive management of undesired changes in alongshore sediment transport in the planning of a waterfront infrastructure

Coastal dynamics of the eastern Gulf of Finland, the Baltic Sea: toward a quantitative assessment

Analysis of River Bank Erosion by Combined Airborne and Long-Range Terrestrial Laser Scanning: Preliminary Results on the Vistula River

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