| Abstract: | Six series of Landsat-1 and Landsat-2 images taken between 1972 and 1976 were analyzed to describe the flow regimens of streams and the regional distribution of vegetation in the Yemen Arab Republic. The findings provide a factual basis for planning a surface-water data collection program, and for preparing maps of plant distribution and agricultural land use. They lay the foundation for modernized water development, for effecting a program of country-wide water management. The work was undertaken as part of the program of the U.S. Agency for International Development with the cooperation of the Yemen Mineral and Petroleum Authority, Ministry of Economy. A false-color composite mosaic of the nine images which cover the country was prepared using Landsat 1 images taken at relatively low sun-angle in winter 1972-73. Catchment areas and the major drainage basins of the country were delineated on this mosaic. In order of increasing water availability, the four catchment areas of the YAR are: Ar Rub al Khali, Wadi Jawf (Arabian Sea), Red Sea, and Gulf of Aden. Most streams are ephemeral. No lakes were detected during the period under investigation, but sebkhas--salt flats or low salt-encrusted plains--are common along the Red Sea coast. In spite of resolution and scale constraints, streamflow was interpreted as perennial or intermittent, wherever it could be detected on several Landsat images covering the same scene at seasonal or yearly intervals. Much of the land under cultivation is restricted to valley floors, and to valley slopes and irrigated terraces adjacent to stream channels. Little or no vegetation could be detected over large regions of the Yemen Arab Republic. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 9261 |
| Citation Author: | Grolier, Maurice J.; Tibbitts, G. Chase; Ibrahim, M. M. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | viii, 111 p. :maps ;26 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 80-565 |
| Citation Search Results Text: | A qualitative appraisal of the hydrology of the Yemen Arab Republic from Landsat images; 1981; OFR; 80-565; Grolier, Maurice J.; Tibbitts, G. Chase; Ibrahim, M. M. |
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| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | A qualitative appraisal of the hydrology of the Yemen Arab Republic from Landsat images; 1981; OFR; 80-565; Grolier, Maurice J.; Tibbitts, G. Chase; Ibrahim, M. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
| Superseded by: |
http://pubs.er.usgs.gov/publication/wsp1757P
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