Morphometric Analyses of Danxia Landforms in Relation to Bedrock Geology: A Case of Mt. Danxia, Guangdong Province, China

Wen, Zhang

doi:10.2174/1874262901307010054

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…The evolutionary processes and formation characteristics of Danxia landform are the topics of greatest concern [6–12]; however, relevant research is predominantly qualitative rather than quantitative. Some recent studies have attempted to use quantitative approaches [13–15]; for example, Yan et al . [16] simulated the evolutionary processes of Danxia landform using a channel-hillslope integrated landscape development (CHILD) numerical model.…”

Section: Introductionmentioning

confidence: 99%

Impacts of rock properties on Danxia landform formation based on lithological experiments at Kongtongshan National Geopark, northwest China

2019

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As an erosional landform, the formation processes of Danxia landform are controlled by internal and external forces as well as lithologic properties. Using field data, we studied the role of lithologic properties on the formation of Danxia landform in Kongtongshan National Geopark, northwest China, through a series of experiments, including uniaxial compressive strength, identification analysis under polarizing microscope, X-ray diffraction analysis, inductively coupled plasma-mass spectrometry analysis, and scanning electron microscopy. The results show that the diagenesis degree, mineral composition, cement composition, degree of cementation, geochemical composition and element contents, and micro-structure influenced the structure and anti-weathering and anti-erosion abilities of the Danxia rock mass. Differential weathering of rock in different environments was an important force shaping the different types of Danxia landform. Weathering failure of the Danxia rock mass was the result of multiple combined factors; as well as lithology, other factors, such as those induced during tectonic uplift (i.e., faulting, jointing, and fracturing) and climate, cannot be neglected. Therefore, lithology played an important role in the structural development of Danxia landform, and different lithologies influenced its weathering rate and formation processes. Our findings can provide a reference for revealing the microscopic development of Danxia landform in arid and semi-arid areas.

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Section: Introductionmentioning

confidence: 99%

Impacts of rock properties on Danxia landform formation based on lithological experiments at Kongtongshan National Geopark, northwest China

2019

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“…Even within areas where one rock type dominates the landscape, subtle variations in mineralogy may lead to differences in landscape morphology (e.g., Flageollet, 1977in Migón, 2006. These variations in rock strength (Zhang et al, 2013) and erodibility (Kühni and Pfiffner, 2001) may influence topography through differential erosion.…”

Section: Introductionmentioning

confidence: 99%

Rock Strength

Hutcherson

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Although contrasts in rock strength correlate to variations in topography, the role of rock strength in shaping the landscape of Yosemite National Park is uncertain. Magmatic processes may create variations in mineralogy within a single plutonic unit, while tectonic processes may result in contrasts in joint density and foliation, all of which may lead to variations in rock strength. For this study, the relationship between differences in mineralogy, joint density, and foliation in Yosemite National Park is analyzed to determine the role of rock strength in shaping Yosemite's topography. Modal mineral abundance and grain size are determined by analyzing cut rock samples, while joint density and foliation intensity are recorded at 83 sites. Also, a Schmidt hammer is used to compare rock strength readings to elevation at all 83 sites. This study finds that variations in joint density shape many topographic features, including Mount Hoffman, a topographic high point in Yosemite. High potassium feldspar and low plagioclase abundance may also be a factor in Mount Hoffman's erosion resistance. No significant relationship between foliation and other factors is observed. Schmidt hammer readings typically increase with elevation, which is likely a result of weathering differences. Decreasing joint density across Yosemite National Park is found to be associated with decreased forestation. Overall, while few correlations are observed across the entire landscape, rock strength shapes the landscape of Yosemite at varying scales.

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Assessing the level of river basin evolution, erosion susceptibility and its correlation with morphometric characteristics using Geoinformatics techniques

Yammani,

Nagabathula

2024

Discov Geosci

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The application of Geoinformatics have become fastest and improved advanced tools to analyse and interpret the topography and hydrological characteristics. This study aimed to utilize the advantage of high resolution (30 m) remote sensing data of Shuttle Radar Topography Mission (SRTM) and the geoinformatic tools of Quantum Geographical Information System (QGIS) for extraction of detailed and accurate drainage morphometry and elevation information in preparation of hypsometric curves. Making use of QGIS, the SRTM data and topographic maps are georeferenced and pre-processed algorithm tools of stream burning and fill-DEM are applied for DEM preparation and extraction of accurate drainage network and its basin areas. From the DEM map, the details of elevation and area of basins are extracted for preparation of hypsometric curves. Hypsometric curves are analyzed to interpret and understand the heterogeneity in the levels of basin evolution/development and erosion at 4th order sub-basin level. The concave hypsometric curves of main basin and sub-basins indicate that total basin as well as sub-basins reached the old/monadnock stage due to the dominance of fluvial process. Based on the hypsometric area/integral (Ea) and Concavity of hypsometric curve values (Eh), five classes/stages of basin development and erosion levels are identified within the old/monadnock stage. The Ea values range from 0.10 to 0.35 and Eh range from 0.25 to 0.77 in this study area. Initial old/monadnock stage of basins have Ea values > 0.28 and Eh values < 0.4 indicating low levels of erosion among the sub-basins. Low hypsometric area/integral value (Ea) indicates the higher level of landmass removal by erosion and basin development. The oldest stage basins are identified with Ea values range from 0.10 to 0.15 and Eh values range from 0.61 to 0.77 indicating higher level of landmass removal/erosion. The lithological variation plays a significant role on hypsometry of the basins. The high hypsometric integral (Ea) values (i.e., 0.28 to 0.35) of 1,2 and 3 sub-basins indicating the early/ initial level of old stage in its’ basin development, since the resistant basalt formation is sandwiched between sandstones prevented deep erosion and depicting less dissected topography. The hypsometric integral has positive correlation with form factor and negative correlation with drainage morphometric characteristics. It indicates that the level of basin evolution increases as the form factor decreases but number of streams, length of streams, mean bifurcation ratio, relief, relief ratio and ruggedness ratio increases. This study is highly useful to understand the relation among morphometric characteristics, basin development and erosion levels through the analysis of hypsometric curves making use of Geoinformatic techniques.

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Morphometric Analyses of Danxia Landforms in Relation to Bedrock Geology: A Case of Mt. Danxia, Guangdong Province, China

Cited by 5 publications

References 30 publications

Impacts of rock properties on Danxia landform formation based on lithological experiments at Kongtongshan National Geopark, northwest China

Impacts of rock properties on Danxia landform formation based on lithological experiments at Kongtongshan National Geopark, northwest China

Rock Strength

Assessing the level of river basin evolution, erosion susceptibility and its correlation with morphometric characteristics using Geoinformatics techniques

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