XXII ISPRS Congress 2012: Technical Commission VIII

Shortis, M.; Shimoda, H.; Cho, K.

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Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663822514

Title:: Technical Commission VIII

Scope:: 590 Seiten

Year of publication:: 2014

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663822514

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Shortis, M.; Shimoda, H.; Cho, K.

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VIII/5: Energy and Solid Earth]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: IDENTIFICATION OF GEOMORPHIC SIGNATURES OF NEOTECTONIC ACTIVITY USING DEM IN THE PRECAMBRIAN TERRAIN OF WESTERN GHATS, INDIA K. S. Jayappa, Vipin Joseph Markose, Nagaraju M.

Document type:: Multivolume work

Structure type:: Chapter

function. Stream links were used for stream order calculation by giving input of flow direction. The resulting stream order grid was converted into ESRI line format by using raster to feature conversion tool. Sub-watersheds were delineated by giving an outlet or pour point, which is the lowest point along the boundary of the watershed. The cells in the source raster are used as pour points above which the contributing area is determined. The drainage systems of 94 tributaries of Valapattanam river basin have been extracted and analyzed (Figure 1). i 32719978 i1290"N 3U81 207 Legend ud River E Sur boss koundary OO. DE FE 264820"E 76a00"E 7841 a0"E 78-SYA07E Figure 1. Map showing location and sub-basins of valapattanam river. 3.1 Geomorphic indices Geomorphic indices applicable to fluvial systems in different regions and of varying size correlate with independently derived uplift rates (Kirby and Whipple, 2001) and are applicable to a variety of tectonic settings where topography is being changed (Bull and McFadden, 1977; Azor et al, 2002). The present study is based on the calculation of five geomorphic indices: Stream-length gradient index (SL), asymmetry factor (AF), hypsometric integral (Hi), drainage basin shape (Bs) and valley floor width-to-height ratio (Vf) for 94 sub-basins of the Valapattanam river basin. All the measurements have been carried out by using drainages and contours extracted from SRTM DEM in GIS environment. 4. RESULTS AND DISCUSSION The results of analyzed geomorphic indices of the Valapattanam river basin are discussed in the following sections. 4.1 Stream length-gradient index (SL) The SL index is a practical tool for measuring perturbations along stream longitudinal profiles, as it is sensitive to changes in channel slope (Burbank and Anderson, 2001). Furthermore, SL index may be used to detect recent tectonic activity by identifying anomalously high index values on a specific rock type (Chen et al., 2003; Zovoili et al., 2004). The SL index of each segment of the river was calculated by the equation (1) SL- (AV/A) L (1) The SL index was calculated for all the 94 sub-basins covering the whole study area and the spatial distribution of SL map was prepared by Inverse Distance Weighted (IDW) interpolation method (Figure 2). High SL values are observed in sub-basins located at the upper part of the river. Several locations along the head water regions of the river basin show anomalous SL values where the river crosses the fault planes, but in the downward part of the river, SL values are found to be distributed uniformly. The values were classified into three categories: SL 2500; 300< SL«500; and «300. The anomalous SL values that are observed in uniform lithological conditions are due to tectonic activities, The SL index value will increase as rivers and streams flow over an active uplifts, and may have lesser values when they are flowing parallel to features such as valleys produced by strike- slip faulting (Keller and Pinter, 2002). dT 1840" 12508 1453208 High : 4524 Low : 0.0321 BEE 75°3007E TS4ŸA0"E 7553 20°E Figure 2. Spatial distribution of SL values. 4.2 Asymmetry factor (Af) Af is an areal morphometric variable used to detect the presence or absence of regional tilt on basin or regional scale. The Af is determined by using the equation (2) (Keller and Pinter, 2002). Af=Ap/A1<100 (2) where, Ag is the area of the basin to the right (facing downstream) of the trunk stream, and Ay is the total area of the drainage basin. An Af factor above or below 50 may result from basin tilting, resulting either from active tectonics or lithologic/structural control, for example the stream slipping down bedding plains over time. The asymmetry factor was computed for selected 94 sub-basins with well developed drainage network. The difference between calculated Af values and neutral value i.e. 50 of the sub-basins vary between 0.17 and 49 (Figure 3). Higher values of Af in the NE-NW regions of the river basin are due to tectonic activity, whereas those near the estuary are due to lithological control. The values were classified into three categories: AF >16; Af <16Af>7; and Af <7. 4.3 Hypsometric curve and Integral (Hi) The hypsometric integral is an index that describes the distribution of elevation of a given area of a landscape. The integral is generally derived for a particular drainage basin and is an index that is independent of basin area. It corresponds to the area below the hypsometric curve and therefore is correlated with the shape of the curve (Keller and Pinter, 2002). We have used an extension called CallHypso (Perez-Pena et al., 2010) of the software ArcGIS 9.2 and a DEM with 90 m resolution for drawing hypsometric curves and calculation of hypsometric integral. Computed Hi values of the sub-basins range from 0.14 to 0.86 (Figure 4). Most of the sub-basins especially those situated 1 values. I hypsome classified <0.4. € 12:8'0"N. 12^19'407M 11*5320"M 42^168'40"N 1275'0"N 11:53720"N 4.4 Ini Drainag planime Where, most di basin r valleys differer associa circula: tectoni tectoni topogr: the sub elongat classifi

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