Introduction to Applied Geomorphological Mapping

AbstractUsing remote sensing extended on geological and topographical maps and verified by the field work, we present the flood management and study the geomorphic features of the floodplain of a large, sand bed, untrained but embanked river in order to determine the flood hazard and to predict future flood scenarios. In geomorphological mapping, we focus on the landforms: crevasse channels and splays, flood basin, chute channels, side arms, floodplain channels, dunes and fields of aeolian sand. We base the flood risk assessment on consultations with environmental engineers who design new technical structures that control inundation (cut-off walls and lattice levees). We describe a levee breach as a result of piping (inner erosion) in a high hydraulic gradient condition and its effect (scour hole) as an erosional landform consistent with the repetitive pattern of erosion and deposition formed by an overbank flow on a floodplain. We reveal an existence of homogenous morphodynamic reaches in the river valley.

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Geomorphological and Geochronological Analysis Applied to the Quaternary Landscape Evolution of the Yeltes River (Salamanca, Spain)

Sustainability ◽

10.3390/su12197869 ◽

2020 ◽

Vol 12 (19) ◽

pp. 7869 ◽

Cited By ~ 1

Author(s):

Iván Martín-Martín ◽

Pablo-Gabriel Silva ◽

Antonio Martínez-Graña ◽

Javier Elez

Keyword(s):

Transfer Functions ◽

Sedimentary Basins ◽

Central Spain ◽

Geomorphological Mapping ◽

Fluvial Terraces ◽

Digital Elevation ◽

Late Neogene ◽

Climate Evolution ◽

Reported Data ◽

Geomorphological Evolution

This paper aims to study the Quaternary geomorphological evolution of the Yeltes river-valley (Duero Basin, Central Spain) primarily based on the study of the Late Neogene piedmont dissected by the river and its Quaternary terrace sequence, since fluvial terraces are excellent archives to study the landscape and climate evolution during this period. Detailed geomorphological mapping implemented in GIS-based digital elevation models was used to the further applications of existing fluvial chronofunctions (relative terrace height-age transfer functions) to establish a numerical geochronology to the sequence of fluvial terraces in the zone. The obtained theoretical ages points to an onset of fluvial incision in the zone after 2.0–2.5 Myr ago, with the dissection of the “Raña surface” (a Gelasian alluvial piedmont widely developed in Central Spain). The obtained terrace ages coincide, in most cases, with warm isotopic stages (MIS) or mainly with the transit of cold to warm MIS. Additionally, this study suggests that the full connectivity of the Yeltes drainage (Ciudad Rodrigo Basin) with the Atlantic drainage was not completely effective until MIS 9 (c. 0.29 Myr). The new reported data allows for the exploration of the timing and processes involved in the capture of inland sedimentary basins (Ciudad Rodrigo, Duero basins) by the Atlantic drainage during the early Quaternary.

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Geomorphological mapping as a tool in the delineation of erosion risk zones in the rio guadalhorce catchment (Spain)

Soil Technology ◽

10.1016/0933-3630(90)90014-t ◽

1990 ◽

Vol 3 (4) ◽

pp. 327-342 ◽

Cited By ~ 1

Author(s):

P. van Gheluu ◽

M. Van Molle

Keyword(s):

Erosion Risk ◽

Geomorphological Mapping ◽

Risk Zones

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Open source riverscapes: Analyzing the river corridor of the Naryn River in Kyrgyzstan based on open access data

10.5194/egusphere-egu21-4735 ◽

2021 ◽

Author(s):

Florian Betz ◽

Magdalena Lauermann ◽

Bernd Cyffka

Keyword(s):

Remote Sensing ◽

Open Access ◽

Large Scale ◽

Data Sets ◽

Hierarchical Systems ◽

Geomorphological Mapping ◽

Open Access Data ◽

Access Data ◽

River Corridors ◽

River Corridor

<p>In fluvial geomorphology as well as in freshwater ecology, rivers are commonly seen as nested hierarchical systems functioning over a range of spatial and temporal scales. Thus, for a comprehensive assessment, information on various scales is required. Over the past decade, remote sensing based approaches have become increasingly popular in river science to increase the spatial scale of analysis. However, data-scarce areas have been mostly ignored so far despite the fact that most remaining free flowing &#8211; and thus ecologically valuable &#8211; rivers worldwide are located in regions characterized by a lack of data sources like LiDAR or even aerial imagery. High resolution satellite data would be able to fill this data gap, but tends to be too costly for large scale applications what limits the ability for comprehensive studies on river systems in such remote areas. This in turn is a limitation for management and conservation of these rivers.</p><p>In this contribution, we suggest an approach for river corridor mapping based on open access data only in order to foster large scale geomorphological mapping of river corridors in data-scarce areas. For this aim, we combine advanced terrain analysis with multispectral remote sensing using the SRTM-1 DEM along with Landsat OLI imagery. We take the Naryn River in Kyrgyzstan as an example to demonstrate the potential of these open access data sets to derive a comprehensive set of parameters for characterizing this river corridor. The methods are adapted to the specific characteristics of medium resolution open access data sets and include an innovative, fuzzy logic based approach for riparian zone delineation, longitudinal profile smoothing based on constrained quantile regression and a delineation of the active channel width as needed for specific stream power computation. In addition, an indicator for river dynamics based on Landsat time series is developed. For each derived river corridor parameter, a rigor validation is performed. The results demonstrate, that our open access approach for geomorphological mapping of river corridors is capable to provide results sufficiently accurate to derive reach averaged information. Thus, it is well suited for large scale river characterization in data-scarce regions where otherwise the river corridors would remain largely unexplored from an up-to-date riverscape perspective. Such a characterization might be an entry point for further, more detailed research in selected study reaches and can deliver the required comprehensive background information for a range of topics in river science.</p>

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GEOMORPHOLOGICAL MAPPING OF THE SERIDÓ REGION, RIO GRANDE DO NORTE STATE/MAPEAMENTO GEOMORFOLÓGICO DA REGIÃO DO SERIDÓ, ESTADO DO RIO GRANDE DO NORTE

William Morris Davis – Revista de Geomorfologia ◽

10.48025/issn2675-6900.v2n2.2021.155 ◽

2021 ◽

Vol 2 (2) ◽

pp. 1-15

Author(s):

SAULO ROBERTO DE OLIVEIRA VITAL ◽

ANDERSON DA SILVA SANTOS ◽

CAIO LIMA DOS SANTOS

Keyword(s):

Rio Grande ◽

Landsat 8 ◽

Geomorphological Mapping ◽

Shuttle Radar Topographic Mission

O mapeamento geomorfológico do Seridó é necessário devido à escassez de produtos dessa natureza, assim como, também, é importante para fins de planejamento e ordenamento territorial, haja vista que a região analisada apresenta cidades em fase de expansão, como, por exemplo, Caicó e Currais Novos. Este trabalho objetivou realizar um mapeamento geomorfológico da Região do Seridó, Estado do Rio Grande do Norte, até o 4º táxon, na escala de 1:100.000. A base de dados utilizada para o mapeamento foi obtida do SRTM (Shuttle Radar Topographic Mission), com resolução espacial de 30 m, onde foram obtidas curvas de nível, sombreamento do relevo, declividade e hipsometria, além de imagens do satélite LANDSAT 8, para distinção de fisionomias. A partir de então, foi possível distinguir as unidades morfoestruturais e morfoesculturais, além de subunidades morfoesculturais e modelados. Os referidos dados servirão de base para o planejamento e gestão ambiental da área de estudo, uma vez que constituem preciosas informações da geodiversidade regional.

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