Qualifying changes in Lake Nyasa surface area using remotely sensed data
| dc.contributor.author | Madungwe, Emaculate | |
| dc.date.accessioned | 2019-12-02T13:11:07Z | |
| dc.date.accessioned | 2020-01-07T15:46:07Z | |
| dc.date.available | 2019-12-02T13:11:07Z | |
| dc.date.available | 2020-01-07T15:46:07Z | |
| dc.date.issued | 2007 | |
| dc.description | Available in print form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF GB1601.72.R42M32) | en_US |
| dc.description.abstract | Inadequate areas of a lake at different water elevations indicate the flooded and exposed areas during excess rainfall and dry seasons respectively. The total area may be estimated from area-elevation curves. There are concerns that the lake extent of African Great Lakes Region have been changing over the years possible causes speculated include climatic changes, land use changes and tectonic and gemorphological process. In this study, a multi temporal approach was applied to investigate the dynamics as measured on historical remotely sensed data. Dry season mapping was done on Lake Nyasa areas from 1990 to the present, on selected dry (2000 and 2006) and wet (1990 and 2004) years when representative satellite images were available. Results showed Lake Nyasa surface area was largest in 1990931 834km2) and lowest in 2006 (25 273 km2). Water levels were averaging at 474 m above mean sea level, and satellite measurements gave higher measurements than gauged readings. Rainfall correlated by 45% of the lake characteristics changes and evaporation had a negative63% correlation coefficient to water levels. Outflows were dependent on water levels. There was evidence that other factors, such as evaporation and erosion could have influence on surface areas. Change detection in the catchment also reveled changes in land cover, with reduction in forest area. The results of the study indicate a high potential for utilization of remote sensing technology for risk analysis on the lake shore and water balance study of the lake. In future, investigations of the rainy season conditions may be investigated, as well as the extent of other African Great Lakes | en_US |
| dc.identifier.citation | Madungwe, E (2007) Qualifying changes in Lake Nyasa surface area using remotely sensed data, Master dissertation, University of Dar es Salaam. Dar es Salaam. | en_US |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/1817 | |
| dc.language.iso | en | en_US |
| dc.publisher | University of Dar es Salaam | en_US |
| dc.subject | Remote sensing, Water level, Nyasa, Lake | en_US |
| dc.title | Qualifying changes in Lake Nyasa surface area using remotely sensed data | en_US |
| dc.type | Thesis | en_US |