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Remote sensing-, gis- and field-base...

Ren, Fang.

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Remote sensing-, gis- and field-based investigations on the controlling factors for the formation of danxia landform, Longhushan, China.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Remote sensing-, gis- and field-based investigations on the controlling factors for the formation of danxia landform, Longhushan, China./
作者:	Ren, Fang.
面頁冊數:	156 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
Contained By:	Dissertation Abstracts International75-10B(E).
標題:	Environmental science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3624111
ISBN:	9781303970764

Remote sensing-, gis- and field-based investigations on the controlling factors for the formation of danxia landform, Longhushan, China.
Ren, Fang.

Remote sensing-, gis- and field-based investigations on the controlling factors for the formation of danxia landform, Longhushan, China. - 156 p.

Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.

Thesis (Ph.D.)--Saint Louis University, 2014.

This item is not available from ProQuest Dissertations & Theses.

Danxia landform, also known as "pseudokarst", is an erosional landform developed from reddish sandstone-breccia formations with steep cliffs. It is a type of erosional landform originally defined in China and is widely distributed in a geologic region called the South China Fold Belt (SCFB). Previous studies have focused on its qualitative characteristics, like steep cliffs, red-colored sedimentary rock, and oddly-shaped rock formations. This study concentrates on the morphogenesis and erosional status of danxia landform in Longhushan, an archetypal danxia landform site in the SCFB, using Geographic Information System (GIS), digital elevation models (DEM), and remote-sensing-based approaches complemented by field investigations. Remote Sensing and DEM have the advantage of providing synoptic overviews to reveal lineaments over large areas and provide a relatively fast way to analyze regional terrains for structural controls on landforms. Topographically negative lineaments are extracted from Digital Elevation Models, which reflect surface expression of danxia valleys and cliffs and may be associated with joints, faults and possibly wider shear zones. Field data provide outcrop-scale fracture patterns and kinematic indicators that may constrain the origin of lineaments in terms of structural origin. Results indicate a correlation between field based fracture orientations and lineament orientations. A two-stage strike-slip kinematic model is suggested to explain most of the mapped lineaments, faults, joint geometries, and cliff spatial distributions. Danxia valleys follow the lineaments and these lineaments are associated with the reactivation of regional faults, demonstrating the dominant role of fracture systems in creating the first-order features of the danxia landscapes. Steep cliffs are formed by failure along tensile joints or shear fractures. This research provides quantitative evidence that fracture control on danxia landforms is more important than previously thought.

ISBN: 9781303970764Subjects--Topical Terms:

677245
Environmental science.

Remote sensing-, gis- and field-based investigations on the controlling factors for the formation of danxia landform, Longhushan, China.
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245 1 0 $a Remote sensing-, gis- and field-based investigations on the controlling factors for the formation of danxia landform, Longhushan, China.
300 $a 156 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
500 $a Adviser: John Encarnacion.
502 $a Thesis (Ph.D.)--Saint Louis University, 2014.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a Danxia landform, also known as "pseudokarst", is an erosional landform developed from reddish sandstone-breccia formations with steep cliffs. It is a type of erosional landform originally defined in China and is widely distributed in a geologic region called the South China Fold Belt (SCFB). Previous studies have focused on its qualitative characteristics, like steep cliffs, red-colored sedimentary rock, and oddly-shaped rock formations. This study concentrates on the morphogenesis and erosional status of danxia landform in Longhushan, an archetypal danxia landform site in the SCFB, using Geographic Information System (GIS), digital elevation models (DEM), and remote-sensing-based approaches complemented by field investigations. Remote Sensing and DEM have the advantage of providing synoptic overviews to reveal lineaments over large areas and provide a relatively fast way to analyze regional terrains for structural controls on landforms. Topographically negative lineaments are extracted from Digital Elevation Models, which reflect surface expression of danxia valleys and cliffs and may be associated with joints, faults and possibly wider shear zones. Field data provide outcrop-scale fracture patterns and kinematic indicators that may constrain the origin of lineaments in terms of structural origin. Results indicate a correlation between field based fracture orientations and lineament orientations. A two-stage strike-slip kinematic model is suggested to explain most of the mapped lineaments, faults, joint geometries, and cliff spatial distributions. Danxia valleys follow the lineaments and these lineaments are associated with the reactivation of regional faults, demonstrating the dominant role of fracture systems in creating the first-order features of the danxia landscapes. Steep cliffs are formed by failure along tensile joints or shear fractures. This research provides quantitative evidence that fracture control on danxia landforms is more important than previously thought.
520 $a DEM and GIS-based morphometry analysis are applied using dimensionless geomorphologic parameters of normalized stream gradient index (SLK), hypsometric integral (HI) and hypsometric curve (HC) as well as river longitudinal profiles. The SLK anomalies for the seven streams across the study area are found to be positively correlated with the presence of faults and rock contacts, indicating tectonic and lithologic controls on the formation of topography. Hypsometric integrals analysis of the 26 subwatersheds in danxia landform areas yield low HI values (<0.42, mean = 0.21) with concave up hypsometric curves, indicating that danxia landforms in Longhushan are in an old erosional stage. These results agree with previously suggested old geomorphic stage for the study area on the basis of qualitative estimates of eroded land mass. This study is the first to apply a quantitative approach to evaluate the erosional stage of danxia landforms and to validate lithological and tectonic controls on surface topography.
520 $a In summary, the findings of this study suggest that the genesis of danxia landform is mainly structurally-controlled aided by erosion of streams and landslides. Danxia landform in Longhushan is in an old erosional stage dominated by fluvial erosion. The geomorphological parameters used in this research can be applied to other danxia landform areas for future comparison.
590 $a School code: 0193.
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650 4 $a Geomorphology. $3 542703
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773 0 $t Dissertation Abstracts International $g 75-10B(E).
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791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3624111