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:: 6 Hydrology: Surface water, oceanography, coastal zone, ice and snow. Chairman: K. A. Ulbricht, Co-chairman: Mikio Takagi, Liaison: R. Spanhoff

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

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: A study with NOAA-7 AVHRR-imagery in monitoring ephemeral streams in the lower catchment area of the Tana River, Kenya. J. W. van den Brink

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 783 A study with NOAA-7 AVHRR-imagery in monitoring ephemeral streams in the lower catchment area of the Tana River, Kenya J.W.van den Brink DHV Consulting Engineers, Amersfoort, Netherlands ABSTRACT: This article presents a case study in which the possibilities of the NOAA-7 AVHRR system are evaluated for the extraction of hydrological information through the monitoring of the vegetation growth in the lower catchment area of the Tana River,Kenya. Emphasis is placed on the assessment of the hydrologic influence of the ephemeral streams in the lower catchment area on the Tana River. Due to the presence of severe cloud cover over the lower catchment no imagery was obtained by the NOAA-7 AVHRR system with sufficient quality to derive the desired information in a period of five months and a near daily coverage of the satellite system. However the imagery shows that the NOAA-7 AVHRR system forms an additional source of information for observation and monitoring of vegetation of large or even moderately sized areas, such as the secundary catchment areas in this study, with sufficient radiometric and spatial discrimination. RESUME: Cet article présente unç étude dans laquelle les possibilités du système NOAA-7 AVHRR sont évaluées pour la déduction d'information hydrologique par 1'enrégistrement de la croissance de la végétation dans la zone de captage inferieur du Tana fleuve au Kénia. Beaucoup d'attention est donnée à l'obtention de l'influence causé par les cours d'eau secondaires (Laga's) qui, dans ce bassin ne produisent de l'eau que pendant une période restreinte de l'année. Parce que Les études étaient exécutées pendant les saisons des pluies, dans deux périodes de 5 mois totales. Il existaint une couverture de nuages persistante dans ces périodes et le système NOAA-7 AVHRR ne procurait, malgré la répétition des observations quotidiennes par la satellite, pas d'images de qualité suffisante pour en déduire l'information désirée. Cependant, les images montrent que le système NOAA-7 AVHRR constitue une source additionelle d'information pour l'observation et l'enregistrement de la végétation dans des zones par sa résolution radiométriques et spatiale même les zones de superficie surface modérée comme le cas des zones sécondaire de captage dans cette étude. 1 INTRODUCTION. The monitoring study of ephemeral streams in the Lower Tana River catchment in Kenya with NOAA-7 AVHRR imagery formed part of the larger Tana River Remote Sensing Study. The Tana River Remote Sensing Study was financed by the Dutch Ministery of Education and Science and the Netherlands Remote Sensing Board (BCRS) and executed by DHV Consulting Engineers, in cooperation with the Delft Hydraulics Laboratry (DHL) and the Research Institute for Nature Management (RIN), all from the Netherlands, together with Landevco from Kenya. The study was carried out as part of the Tana River Morphology Studies in which the same organizations participate. The Tana River Morpho logy has the objective to analyse the effect of current and future interventions, such as reser voirs and irrigation schemes and the morphology of the Tana River and the riverine lands. 2 OBJECTIVES. The lower catchment area of the Tana River is a very large and inaccessible area only inhabited by a small number of roaming pastoralists. The area contains some 90 smaller and larger ephemeral streams, called Laga's, which flow into the Tana River. Only during the two rainy seasons, a period in may-june with long-rains when more than half of the annual precipitation falls and a period in october-december with short rains, it can be expected that water is carried by the Laga's. It was the objective of the case study to evaluate the hydrologic influence of these Laga's on the Tana River. Given the constraints described above any research in the area require a lot of manpower and logistics. Therefore the use of satellite imagery was investigated for the extraction of the desired hydrological information. Figure 1. Mosaic of Landsat images of the Lower Tana River area(near-infrared channel, June 1975)

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