Inferring volumetric changes at a shallow lake from subpixel satellite-derived shorelines

Palomar-Vázquez, Jesús; Cabezas-Rabadán, Carlos; Castañeda, Carmen; Prieto, Francisco Javier Gracia; Fernández-Sarría, Alfonso; Priego, E.; Pons-Crespo, Ramón; Pardo-Pascual, Josep E.

doi:10.1016/j.apgeog.2022.102792

Cited by 3 publications

(5 citation statements)

References 34 publications

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“…As a result, it is expected that the lakebed surface was temporarily exposed during intermittent or seasonal dry periods. For the remaining 33 years where the minimum level recorded was above zero, the seasonal variability of the lake, expressed as the difference between the maximum and minimum lake levels per year, was an average of 0.46 m. A detailed evolution of the water surface and volume evolution of Gallocanta Lake during the last decades from satellite imagery is available in Palomar‐Vázquez et al (2022). A selection of some remote sensed images has been included in Figure 6b for illustrating the different aspects of the lake during contrasted water level stages.…”

Section: Resultsmentioning

confidence: 99%

“…The lake water level data come from field readings managed by the Ebro River Basin Authority (Confederación Hidrográfica del Ebro, CHE). Previous studies estimated the water surface from satellite images for the periods 1991–2000 (CHE, 2004) and 1984–2020 (Palomar‐Vázquez et al, 2022), although both studies encompassed a broad area around the main lake body. These datasets were not considered here in order to maintain the data source homogeneity and avoid any mixture of different types of information that produce different types of variables, often difficult to compare.…”

Section: Methodsmentioning

confidence: 99%

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Water level control on coastal landform distribution and associated processes in a highly fluctuating shallow lake (Gallocanta Lake, NE Spain)

Gracia,

Castañeda,

Simarro

et al. 2023

Earth Surf Processes Landf

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Shallow lakes in semi‐arid environments are very sensitive to hydrological alterations associated with climate change. Their shorelines and geometry can change according to water level fluctuations. Gallocanta Lake (NE Spain) is a typical example of such lacustrine conditions because it is exposed to strong winds parallel to its elongation axis and is located in a semi‐arid Mediterranean environment. In this work, a high‐resolution digital elevation model (DEM) of the area is used to compare the distribution of coastal forms (beaches, barrier islands, deltas, lagoons, etc.) with the frequency at which different water levels are attained. As a result, a clear relationship is obtained between presently active forms and the water levels most frequently reached in the lake. It is deduced that, once formed, the surrounding coastal plains related to these coastal forms control the permanence of water around a given height interval, favouring the development of these morphologies, in a positive feedback mechanism only broken by subsequent climate warming and lake water lowering. The hydrodynamic conditions responsible for activating the coastal forms have been analysed by applying a mathematical model of wind‐driven currents in the lake that predicts the present erosional/progradational trends associated with them. The combination of the different results obtained was used to generate a synthetic map of active coastal processes and trends along the lake shore during high water episodes, with two versions according to the two dominant wind scenarios in the region. The distribution of erosion/sedimentation trends along the lake shores has helped to propose the existence of longitudinal littoral cells, each one recording different shoreline trend (retreat, progradation, and stability), depending on the prevailing wind scenario. This synthetic scheme can be useful for predicting the eco‐morphological trends of the lake shore and adapting the present management practices in this protected area accordingly.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Water level control on coastal landform distribution and associated processes in a highly fluctuating shallow lake (Gallocanta Lake, NE Spain)

Gracia,

Castañeda,

Simarro

et al. 2023

Earth Surf Processes Landf

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“…On that day, significant discrepancies appeared among both VDWLs (defined by P1 and P2) when using the same type of image (Timex and Snap), but also when the same user employed different types of images. This was largely motivated by the presence of water-covered areas produced by the tidal ebb, also possibly influenced by the high range of the spring tides that occurred a few days earlier (17)(18)(19)). This is an example of another source of uncertainty in the analysis that hinders photo interpretations in mesotidal environments and with the presence of mesoforms.…”

Section: The Uncertainty In the Waterline Definition In Dissipative C...mentioning

confidence: 99%

“…This is the case of the MNDW index developed by Xu [16] and employed by CoastSat [10] and the AWEI index proposed by Feyisa et al [17]. In turn, AWEInsh with a 0 threshold has appeared as a robust and accurate method for shoreline extraction both at oceanic coasts [18] and inland water bodies [19].…”

Section: Introductionmentioning

confidence: 99%

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Assessing Satellite-Derived Shoreline Detection on a Mesotidal Dissipative Beach

Cabezas-Rabadán,

Almonacid-Caballer,

Benavente

et al. 2024

Remote Sensing

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The accuracy and robustness of the shoreline definition from satellite imagery on different coastal types are crucial to adequately characterising beach morphology and dynamics. However, the generic and widespread application of satellite-derived shoreline algorithms is limited by the lack of robust methods and parameter assessments. This work constitutes a quantitative and comprehensive assessment of the satellite-derived waterlines from Sentinel-2 by using the novel SAET tool (Shoreline Analysis and Extraction Tool) on the exposed and mesotidal beach of La Victoria (Cádiz, SW Spain). The diverse parameters available in SAET, such as water indexes, thresholding methods, morphological filters, and kernel sizes, were combined to define water/land interface positions that were compared against coincident video-derived waterlines. Satellite-derived waterline errors are found to be affected by extraction parameters, as well as by the oceanographic and morphological conditions at the time of the image acquisition. The application of a morphological erosion filter on the water mask, which tends to shift the extracted waterline seawards and reduce bias, is the best solution at the dissipative site of La Victoria Beach. Moreover, using a 3 × 3 kernel size consistently shows higher accuracies than a larger kernel. Although there was no parameter combination showing the best skill for all dates, the employment of the Automated Water Extraction Index for images with no shadows (AWEInsh) with a threshold = 0, erosion morphological filter, and 3 × 3 kernel was, overall, the best combination of extraction parameters for this beach (average waterline RMSE of 5.96 m). The combination of the Modified Normalised Difference Water Index (MDNWI) with the Otsu thresholding also led to similar positions of the resulting waterlines and offered good accuracies. In line with other recent research efforts, our work stresses the lack of generic shoreline extraction solutions that can be applied automatically at a global level and the necessity to adapt and validate the extraction methodologies to the different types of coastlines.

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Assessment of satellite-derived shorelines automatically extracted from Sentinel-2 imagery using SAET

Pardo-Pascual,

Almonacid-Caballer,

Cabezas-Rabadán

et al. 2024

Coastal Engineering

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Inferring volumetric changes at a shallow lake from subpixel satellite-derived shorelines

Cited by 3 publications

References 34 publications

Water level control on coastal landform distribution and associated processes in a highly fluctuating shallow lake (Gallocanta Lake, NE Spain)

Water level control on coastal landform distribution and associated processes in a highly fluctuating shallow lake (Gallocanta Lake, NE Spain)

Assessing Satellite-Derived Shoreline Detection on a Mesotidal Dissipative Beach

Assessment of satellite-derived shorelines automatically extracted from Sentinel-2 imagery using SAET

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