XXII ISPRS Congress 2012: Technical Commission VIII

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

Bibliographic data

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/4: Water]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: YANGON RIVER GEOMORPHOLOGY IDENTIFICATION AND ITS ENVIROMENTAL IMAPACTS ANALSYSI BY OPTICAL AND RADAR SENSING TECHNIQUES Aung Lwin, Myint Myint Khaing

Document type:: Multivolume work

Structure type:: Chapter

significantly or the case of 5^ Edition. note Sensing, 55, 474, 535. ng and Image Inc., pp. 176- rrain analysis ITC, The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia YANGON RIVER GEOMORPHOLOGY IDENTIFICATION AND ITS ENVIROMENTAL IMAPACTS ANALSYSI BY OPTICAL AND RADAR SENSING TECHNIQUES Aung Lwin®, Myint Myint Khaing® "Remote Sensing Department, Mandalay Technological University, Myanmar - aung.al2006@ gmail.com "Remote Sensing Department, Mandalay Technological University, Myanmar - drmmkhaing@gmail.com Working Group VIII/4: Water KEY WORDS: Fluvial, Sedimentology, LULC, Hydrologic process, Environmental impacts ABSTRACT: The Yangon river, also known as the Rangoon river, is about 40 km long (25miles), and flows from southern Myanmar as an outlet of the Irrawaddy (Ayeyarwady) river into the Ayeyarwady delta. The Yangon river drains the Pegu Mountains; both the Yangon and the Pathein rivers enter the Ayeyarwady at the delta. Fluvial geomorphology is based primarily on rivers of manageable dimensions. The emphasis is on geomorphology, sedimentology of Yangon river and techniques for their identification and management. Present techniques such as remote sensing have made it easier to investigate and interpret in details analysis of river geomorphology. In this paper, attempt has been made the complicated issues of geomorphology, sedimentation patterns and management of river system and evolution studied. The analysis was carried out for the impact of land use/ land cover (LULC) changes on stream flow patterns. The hydrologic response to intense, flood producing rainfall events bears the signatures of the geomorphic structure of the channel network and of the characteristic slope lengths defining the drainage density of the basin. The interpretation of the hydrologic response as the travel time distribution of a water particle randomly injected in a distributed manner across the landscape inspired many geomorphic insights. In 2008, Cyclone Nargis was seriously damaged to mangrove area and its biodiversity system in and around of Yangon river terraces. A combination of digital image processing techniques was employed for enhancement and classification process. It is observed from the study that middle infra red band (0.77mm - 0.86mm) is highly suitable for mapping mangroves. Two major classes of mangroves, dense and open mangroves were delineated from the digital data. 1. INTRODUCTION 1.1 Landforms formed by rivers Running water in fixed channels is the most widespread agent of land sculpturing working on earth's surface. Therefore, the landforms created are more important than those formed by other agents. Flow of water takes place in rivers under the influence of gravitation. The type of flow can be laminar or turbulent. ‘Laminar’ flow is a flow in which the streamlines remain parallel to the axis of the flow. In a ‘turbulent’ flowing river, a mixing of water by turbulent eddies takes place. A river can erode when it transports material. The transport can take place in different ways: - in solution - in suspension - these are the small particles carried in suspension. - in saltation - sand grains hop over the bottom, the sand grain reaching the bottom gives an impulse to another sand particle. - shoving: coarse material rolls over the river bed. Coarse material is often deposited as riffles and bars in the riverbed, these bars are placed alternating in the left and right side of the river and form bank bars. In braided channels with criss crossing waterways, channel-bars and islands develop between the water courses. Laboratory experiments have shown that the cross section of a channel transporting the same volume of water is dependent on the type of bed material. Fine material gives a deeper bed, coarse material a flatter, broader river bed. A river can have a straight, a sinuous, meandering, or a braiding channel. A meandering river flows in sinuous curves. Meanders are arbitrarily confined to a ratio of channel length to valley length. The water in the meander moves as a corkscrew, the so called helicoidal flow, that means that the flow is downstream, but besides that a movement in perpendicular direction occurs, formed by the centrifugal force on the water in the bend. This type of flow causes erosion in the outer(concave) side of the meander and deposition in the inner(convex) side. The strongest erosion takes place a short distance after the central part of the bend. This causes "point bars" to develop on the inner side, and the meander to migrate downstream. A meander tries to broaden and to move downstream. When meanders attain extreme looping, a cutting of the meander can be formed during avulsions. In the cut-off part an oxbow-lake is formed. In aerial photographs old cut-off meanders, meander scrolls or point bars etc. can be easily distinguished. The zone where the meanders are formed is called "meander-belt". Sometimes a relation between the width of the channel and the width of the meander belt exists, according to different authors the relation varies between 1:12 and 1:18. A 'braiding' river is characterised by different criss-crossing channel ways around alluvial islands. The growth of an island begins as the deposition of a central bar starts. The bar grows downstream and in height and forces the water to pass through the flowing water channels. 1.2 Remote sensing techniques for landform Analysis Remote sensing techniques have opened new vistas for landform analysis (both static and dynamic aspects), coupled with field verification surveys. Landforms can be directly and best viewed using remotely sensed data, since relief forms are well expressed on the surface of the earth and recorded in

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