University of Twente Student Theses
Variation in discharge due to changes in vegetation-cover characteristics in the Keduang catchment, Indonesia
Maris, H.L. (2015) Variation in discharge due to changes in vegetation-cover characteristics in the Keduang catchment, Indonesia.
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| Abstract: | The Indonesian environment has changed significantly in recent decades. Land use and land cover have changed dramatically, and this has caused floods and high discharges. Land use and land cover changes have been studied extensively, but vegetation-cover characteristics have been studied a little less. This study investigates the relationship between variation in discharges and changes in vegetation-cover characteristics in the Keduang catchment, Indonesia. The years with useful discharges were analyzed first. After a check with a water balance, the years 1991, 1992, 2006, 2007, 2010, 2011, 2012 turned out to be useful. The most important vegetation-cover characteristics were studied next. For this research, the LAI, size of area with healthy vegetation, number of trees, diameter of trees and tree height were used. The LAI was measured by use of hemispherical pictures. The size of area with healthy vegetation was measured with spatial data. The number of trees was determined in the field. The diameter of trees was measured using a tape measure, and tree height was measured with a haga-meter. The NDVI (normalized difference vegetation index) was extracted from the spatial data which was downloaded from www.glovis.usgs.gov. A linear relationship was found between the NDVI and the LAI of June 2015. However, the LAI and the discharge of the Keduang do not show a relationship, as the distribution of the LAI was the same during the years. The size of the area with healthy vegetation in the Keduang is related to the discharge: when the size of area with healthy vegetation increases, the discharge decreases. |
| Item Type: | Essay (Bachelor) |
| Faculty: | ET: Engineering Technology |
| Subject: | 56 civil engineering |
| Programme: | Civil Engineering BSc (56952) |
| Link to this item: | https://purl.utwente.nl/essays/68512 |
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