Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

damen, m. c. j.

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Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856641294

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: IX Seiten, Seiten 551-956

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A,. A. Balkema

Identifier (digital):: 856641294

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,2)

Language:: English

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

Editor:: Damen, M. C. J.

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 5 Non-renewable resources: Geology, geomorphology and engineering projects. Chairman: J. V. Taranik, Liaison: B. N. Koopmans

Write comment:: Wegen zu enger Bindung kommt es teilweise im Original zu Textverlust.

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Monitoring geomorphological processes in desert marginal environments using multitemporal satellite imagery. A. C. Millington & A. R. Jones, N. Quarmby & J. R. G. Townshend

Document type:: Multivolume work

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631 eir gratitudes n Geologic Sur- he sincere help and mosaics, and staff of hams University p and providing roleum geology, orld oil, Circ- d, p.99-112. pies of geomor- . Systematic of the Qift- rn Desert, Egy- P .25. tion to the or- Origin of its ol. Congr.,K’i ysis in geolog on. Amer. Asso. . 22^6-2259. Hydrogeology •rt, Red Sea ¡is, AinShams calculations ccassional flo- in, Eastern De- Egypt. 5 th 4. aphs in geolog- g. U.S. Geol. Sgypt. Amsterd- raphy of the ed Sea. In 71-81. Newyork, nd Erythrean Algiers. 15» &s of geomorph- Sons. sensing in Sevier. pattern of Eg- A.A.P.G. Bull. Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Monitoring geomorphological processes in desert marginal environments using multitemporal satellite imagery A.C.Millington & A.R.Jones University of Reading, UK N.Quarmby & J.R.G.Townshend NERC Unit for Thematic Information Services, Reading, UK ABSTRACT: Methods for geomorphological process monitoring and change detection using digitally processed multitemporal Landsat TM & MSS imagery are evaluated in south-central Tunisia. Three categories of changes are detected - sub-sampling unit, seasonal and long-term changes. Hydrological and geomorphological changes in Tunisian playas are examined within these categories. Both surface water and groundwater are important in determining salt and sediment budgets on these playas RESUME: Les méthodes geomorphologiques des processus de mesurement et de detection des changements en tilisant le traitement des images multitemporales Landsat TM and MSS sont évaluées au centre-sud de la Tunisie. Trois changements de categories sont detectes - unite sous-echantillon, saisoniere et changements a long terme Les changements hydrologiques et geomorphologiques dans les playas tunisiennes sont examines dans les memes categories. Les eaux de surface ainsi que celles sous terre sont importantes pour determiner la balance entre sel et sediment des playas 1 INTRODUCTION The monitoring of sediment transfer processes in arid and semi-arid environments has many important applications for engineering problems (e.g. Cooke et al., 1982; Doornkamp et al., 1980) and land evaluation procedures (Mitchell, 1982; Purdie 1984) . A closer examination of these problems focusses attention on the difficulty of monitoring sediment transfer processes to obtain information for resource assessment and environmental planning. Geomorphological processes on the desert margin are characterised by:- 1. high-magnitude and low-frequency events, 2. a strong seasonality, 3. occurrences as spatially discrete and, often, uncorrelated events. These characteristics make semi-arid geomorpho logical processes difficult to monitor using conventional ground-based instrumentation because there is a very low probability of measuring any geomorphological event in a specific locality using site-specific instrumentation. However the probab ility is increased if either the time or spatial dimensions are increased. The time dimension is, for all practical monitoring purposes, inflexible. However events can be monitored in a relatively short time period if a suitably large area is examined which will increase the number of sites where processes are active. The synoptic capability of satellite data provides large enough areas for this and makes the monitoring of sediment transfer processes, utilising change detection algorithms on multidate imagery, a distinct possibility. This methodology is currently being evaluated in south-central Tunisia using Landsat MSS and TM data acquired between 1981 and 1985. Attention is being focussed on geomorphological change in three major process-domains - alluvial fans, braided river systems and playas. This paper presents the first observations from this project and concentrates on playa environments. 2 BACKGROUND TO THE STUDY AREA 2.1. Geomorphological Processes Water plays a central role in the transfer of sedimentary materials in south-central Tunisia although wind becomes an increasingly important agent further south. The main components of the fluvial system on the desert margin are: i) Catchment slopes and pediments ii) River channels iii) Alluvial fans iv) Enclosed depressions containing playas (known locally as Chotts). Over time materials are transferred from mountain slopes by slope erosion, river channels and alluvial fans. Finer textured material is deposited in the playas, whilst the coarse material is left in the channels and fans and on the slope as lag deposits. It is clear that this transfer of sediment is a far from continuous process and episodic erosion and deposition prevail often with long periods during which materials are stored in the components of the fluvial system. Aeolian activity is important in the dry season when gypsiferous sands are deflated from the playa surfaces, and redistributed on the surrounding landforms. The wind-blown material deposited in channels is then flushed through the system during the next spate of fluvial activity. Sandy materials are also blown into the area from the south in the late winter and early spring. 2.2. Geology The study area is dominated by Cretaceous and Tertiary sediments which have been subjected to Alpine folding, (Burollet, 1967; Coque and Jauzien 1967). The area is dominated by a series of eroded anticlines and synclines which give rise to many resistant dolomite and limestone cuestas with intervening valleys formed by the differential weathering and erosion of marls and clays which are now filled with late Tertiary and Quaternary sediment.

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