| Abstrakt: |
The study has taken the opportunity of Landsat (1990-2010) satellite images, SRTM digital elevation model data and water discharge data of one gauging station to understand the temporal dynamics of the Tista River in the last two decades. Along with the enormous impact of flash floods the construction of Gajoldoba Barrage has played the key to change the braided planform of the river. The river upstream of Gajoldoba Barrage is characterized by eastward shifting (upper portion), westward shifting (an immediate upper portion of the barrage), decreasing sinuosity, increasing braid-channel ratio, an increase in the number of sub-channels and a reduction in the size of channel bars etc. The river downstream of the barrage is characterized by westward migration, decreasing sinuosity, increasing braid-channel ratio, an increase in the number of subchannels, and a reduction in the size of channel bars etc. moreover, the study reflects a significant comparison of the morphological dynamics between the up and downstream of the river. [ABSTRACT FROM AUTHOR] |
