Modeling morphodynamic processes in a meandering river with unmanned aerial vehicle-based measurements

Akay, Semih Sami; Özcan, Orkan; Şen, Ömer Lütfi

doi:10.1117/1.jrs.13.044523

Cited by 10 publications

(21 citation statements)

References 35 publications

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“…The lowest and highest SI values were usually observed in January and September 2019, respectively. A comparison of these with the measurements of an earlier study involving the same locations, indicates that the SI values in June 2018 and September 2019 are close to the SI values observed in January 2018 in that study [31]. The flood event occurred in January 2019 was such an effective factor that led the meanders to change shape.…”

Section: Plos Onesupporting

confidence: 78%

“…Fig 13 represents the areal and volumetric change analyses of the eroded/deposited sediments for locations that fall into each TRMM grid. Here the analyses include our previous field surveys for the period of 2018 [ 31 ]. Each point in the graphs was obtained by subtracting the total area/volume from the previous field survey measurement value.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, a baseline was produced by creating a buffer zone of 2-meters towards the land by referring to the riverbank of January 2019. Since there was no data in January 2019 for Location 3, baseline was produced by creating buffer zone at 2-meter intervals based on the produced riverbank of January 2018 in the previous phase of the study [ 31 ]. The riverbanks towards the direction of river flow were defined as two different regions on the riverbanks.…”

Section: Dataset and Methodsmentioning

confidence: 99%

“…Two-year monitoring revealed that the SI values changed during the flood approached the pre-flood values over time. For instance, the SI values of September 2019 have approached those of January 2018 [ 31 ]. In Fig 2 , the characterization of the study locations with the SI values and their locations in the basin are shown.…”

Section: Study Area and Multi-temporal Field Surveysmentioning

confidence: 99%

“…Multi-temporal UAV-derived DSMs have been recently used to calculate the rate of volumetric and spatial change in sediments with high accuracy [3,[22][23][24][25][26][27][28][29][30][31]. Morphological changes along the river beds can be monitored by UAV flights at sequential time intervals.…”

Section: Introductionmentioning

confidence: 99%

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UAV-based evaluation of morphological changes induced by extreme rainfall events in meandering rivers

et al. 2020

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Morphological changes, caused by the erosion and deposition processes due to water discharge and sediment flux occur, in the banks along the river channels and in the estuaries. Flow rate is one of the most important factors that can change river morphology. The geometric shapes of the meanders and the river flow parameters are crucial components in the areas where erosion or deposition occurs in the meandering rivers. Extreme precipitation triggers erosion on the slopes, which causes significant morphological changes in large areas during and after the event. The flow and sediment amount observed in a river basin with extreme precipitation increases and exceeds the long-term average value. Hereby, erosion severity can be determined by performing spatial analyses on remotely sensed imagery acquired before and after an extreme precipitation event. Changes of erosion and deposition along the river channels and overspill channels can be examined by comparing multi-temporal Unmanned Aerial Vehicle (UAV) based Digital Surface Model (DSM) data. In this study, morphological changes in the Büyük Menderes River located in the western Turkey, were monitored with pre-flood (June 2018), during flood (January 2019), and post-flood (September 2019) UAV surveys, and the spatial and volumetric changes of eroded/deposited sediment were quantified. For this purpose, the DSAS (Digital Shoreline Analysis System) method and the DEM of Difference (DoD) method were used to determine the changes on the riverbank and to compare the periodic volumetric morphological changes. Hereby, Structure from Motion (SfM) photogrammetry technique was exploited to a low-cost UAV derived imagery to achieve riverbank, areal and volumetric changes following the extreme rainfall events extracted from the time series of Tropical Rainfall Measuring Mission (TRMM) satellite data. The change analyses were performed to figure out the periodic morphodynamic variations and the impact of the flood on the selected meandering structures. In conclusion, although the river water level increased by 0.4–5.9 meters with the flood occurred in January 2019, the sediment deposition areas reformed after the flood event, as the water level decreased. Two-year monitoring revealed that the sinuosity index (SI) values changed during the flood approached the pre-flood values over time. Moreover, it was observed that the amount of the deposited sediments in September 2019 approached that of June 2018.

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Section: Plos Onesupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Dataset and Methodsmentioning

confidence: 99%

Section: Study Area and Multi-temporal Field Surveysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UAV-based evaluation of morphological changes induced by extreme rainfall events in meandering rivers

et al. 2020

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Method for UAV-based 3D topography reconstruction of tidal creeks

Zhang

Gong

et al. 2021

J. Geogr. Sci.

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It is common to obtain the topography of tidal flats by the Unmanned Aerial Vehicle (UAV) photogrammetry, but this method is not applicable in tidal creeks. The residual water will lead to inaccurate depth inversion results, and the topography of tidal creeks mainly depends on manual survey. The present study took the tidal creek of Chuandong port in Jiangsu Province, China, as the research area and used UAV oblique photogrammetry to reconstruct the topography of the exposed part above the water after the ebb tide. It also proposed a Trend Prediction Fitting (TPF) method for the topography of the unexposed part below the water to obtain a complete 3D topography. The topography above the water measured by UAV has the vertical precision of 12 cm. When the TPF method is used, the cross-section should be perpendicular the central axis of the tidal creek. A polynomial function can be adapted to most shape of sections, while a Fourier function obtains better results in asymmetrical sections. Compared with the two-order function, the three-order function lends itself to more complex sections. Generally, the TPF method is more suitable for small, straight tidal creeks with clear texture and no vegetation cover.

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Multitemporal UAV surveys of geomorphological changes caused by postfire heavy rain in Kamaishi city, northeast Japan

Touge

Hasegawa²,

Minegishi³

et al. 2023

CATENA

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Modeling morphodynamic processes in a meandering river with unmanned aerial vehicle-based measurements

Cited by 10 publications

References 35 publications

UAV-based evaluation of morphological changes induced by extreme rainfall events in meandering rivers

UAV-based evaluation of morphological changes induced by extreme rainfall events in meandering rivers

Method for UAV-based 3D topography reconstruction of tidal creeks

Multitemporal UAV surveys of geomorphological changes caused by postfire heavy rain in Kamaishi city, northeast Japan

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