Use of morphometric variables and self-organizing maps to identify clusters of alluvial fans and catchments in the north Peloponnese, Greece

Karymbalis, Efthimios; Ferentinou, Maria; Giles, Philip

doi:10.1144/sp440.7

Cited by 9 publications

(4 citation statements)

References 54 publications

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“…Figure 4. Radial profiles A-A ′ , B-B ′ , and C-C ′ from the apex to the shoreline, and corresponding slope segments between the apex and the escarpment of the coastal cliff; ᾱis the mean slope angle along the profile from the apex to the onset of the cliff; C r is an index of concavity along the radial fan profiles adapted after Karymbalis, Ferentinou, and Giles (2016) and defined as the ratio of the elevation difference between the radial profile and the midpoint of a straight line joining the fan apex and the onset of the coastal cliff, and the elevation difference between the onset of the cliff and the midpoint. The course of the profiles is shown in Figure 1.…”

Section: Results and Discussion: Morphography And Morphogenesis Of Thmentioning

confidence: 99%

Geomorphology of the coastal alluvial fan complex Guanillos, northern Chile

et al. 2019

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The evolution of alluvial fans on the narrow coastal plain of the Atacama Desert in northern Chile is so far poorly investigated. Therefore, a detailed geomorphological map at a scale of 1:7500 of a coastal alluvial fan complex at Guanillos (21°58 ′ S, 70°10.5 ′ W) is provided as a first step to understand the fan's morphogenesis. Geomorphological mapping was based on a digital elevation model with a resolution of 2 m generated from Pleiades-1 tri-stereo satellite imagery, derived terrain parameters, and on-site field mapping. The resultant map is used to characterize and categorize the overall morphology of the alluvial fan complex. In particular, linear features constructed by primary alluvial fan processes can be differentiated successfully from those developed by secondary processes. Furthermore, the advanced evolutionary state of the fan complex is revealed. We introduce a morphostratigraphic model comprising the fan's prograde evolution, dissection, and successive abandonment of surface generations.

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Section: Results and Discussion: Morphography And Morphogenesis Of Thmentioning

confidence: 99%

Geomorphology of the coastal alluvial fan complex Guanillos, northern Chile

et al. 2019

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“…The relatively uniform climate in the Corinth Rift main shoulder suggests that it has little effect on the observed along-rift landscape variability (Karymbalis et al, 2016a); however, lithology varies in the study area (Fig. 1).…”

Section: Discussion: Relief Response To Evolution Of the Corinth Riftmentioning

confidence: 99%

“…Both Gilbert deltas large size and prominent foresets (Seger and Alexander, 2009) suggest that Dervenios-Olivos was an extensive long lived catchment. Younger and modern underdeveloped Gilbert deltas (Karymbalis et al, 2016a;Rohais et al, 2007) develop in relation to the newly formed short and steep exorheic Dervenios River.…”

Section: Mechanical and Tectonic Implicationsmentioning

confidence: 99%

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2017

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Crustal elastic flexure on the flanks of rift-forming faults is a key feature to characterize continental rifting processes that can be resolved by means of transient river drainages on rift footwalls. Here we show that the elastic flexure dynamics of the uplifting southern shoulder of the rapidly-extending, asymmetric Corinth Rift (Greece) are recorded in 3D by its fluvial network. We explore the evolution of the mechanical flexure of the lithosphere at rift full length by means of DEM-based river profile analysis of a series of footwall catchments that drain roughly orthogonal to the rift active fault system. We show that elastic footwall flexure describes the first-order geometry of river longitudinal profiles. Flexure amplitude is maximal in the centre of the rift, where drainage reversal of two catchments suggests very fast slip rates on the active fault system, and decays (i) gently to the west, where transient river profiles exhibit a morphology consistent with relatively lower rates of flexural uplift and there exists evidence for active drainage reorganization, and (ii) sharply to the east, where river profiles are near equilibrium with the modern displacement field. These observations are consistent with landscape responding to growth of a new master fault as a function of slip rate increases and/or onset time. The occurrence of drainage reversal by footwall flexure in the rift centre suggests an extremely rapid footwall flexural uplift due to a sharp increase in master fault slip rate. Lateral changes in river morphology along the rift margin are consistent with either smaller rates of footwall flexural uplift or younger onset of faulting along strike away from the center of the master fault. Further, the extent of flexure, over the full length of the Corinth Rift (~100 km), requires a steep fault growing in a strong crust. These observations are at odds with Corinth Rift growth models of protracted extension and parallel basinwards-migrating faults linked or not at depth with a shallow detachment. To the contrary, our results support the hypothesis of rift growth by lateral along-strike addition of fault segments triggered by a recent shift in plate boundary conditions <1 Ma, an evolution compatible with the southwestwards process zone tip propagation of the North Anatolian Fault.

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“…Such studies incorporate quantitative measurements that allow for geomorphologists to calculate morphometric parameters that may be useful in detecting anomalies in the fluvial systems, produced by local changes that result from tectonic uplift or subsidence. Such approaches provide a quantitative method for the evaluation of the influence of active tectonics on landscape morphology and drainage evolution in a specific area [2,6].…”

Section: Introductionmentioning

confidence: 99%

Μorphometric Analysis for the Assessment of Relative Tectonic Activity in Evia Island, Greece

et al. 2020

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The aim of this study is to evaluate the relative tectonic activity in the north part of the Evia Island, located in Central Greece, and to investigate the contribution of neotectonic processes in the development of the fluvial landscape. Five morphometric parameters, including Drainage Basin Slope (Sb), Hypsometric Integral (Hi), Asymmetry Factor (Af), Relief Ratio (Rh), and Melton’s Ruggedness Number (M), were estimated for a total of 189 drainage basins. The catchments were classified into two groups, according to the estimated values of each morphometric parameter, and maps showing their spatial distribution were produced. The combination of the calculated morphometric parameters led to a new single integrated Index of relative tectonic activity (named Irta). Following this indexing, the basins were characterized as of low, moderate, or high relative tectonic activity. The quantitative analysis showed that the development of the present drainage systems and the geometry of the basins of the study area have been influenced by the tectonic uplift caused by the activity of two NW-SE trending offshore active normal fault systems: the north Gulf of Evia fault zone (Kandili-Telethrion) and the Aegean Sea fault zone (Dirfis), respectively. The spatial distribution of the values of the new integrated index Irta showed significant differences among the drainage basins that reflect differences in relative tectonic activity related to their location with regard to the normal fault systems of the study area.

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Use of morphometric variables and self-organizing maps to identify clusters of alluvial fans and catchments in the north Peloponnese, Greece

Cited by 9 publications

References 54 publications

Geomorphology of the coastal alluvial fan complex Guanillos, northern Chile

Geomorphology of the coastal alluvial fan complex Guanillos, northern Chile

Untitled

Μorphometric Analysis for the Assessment of Relative Tectonic Activity in Evia Island, Greece

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