Pool and Riffle Sequences and Morphology of Lower Alaknanda River in Srinagar Valley (Garhwal Lesser Himalaya), India
This study analyzes the pool-riffle sequences of the lower Alaknanda River within the context of mountain meandering river. It is based on the 1/50000 topographical map, CARTOSEAT1 image and field investigation. The data for 8 pools and 18 riffle of 11.5 km channel length are tabulated. The main controlling variables considered for the study are width, depth, spacing, bank full width, length and tectonic setting. The average depth of the pool is 7.75 m. The average width of the pool is 54 m while the average bank full width is 120 m. The average width and depth ratio of the pool is 7.74 which vary from 4 to 12.5. The average spacing of the pool is calculated about 1.4 km. The channel width at riffle is significantly greater than that at the pool. The trend of the regression line shows that there is a negative correlation between depth and width variables and bank full width. The results of the investigation show that the pools and riffles are controlled by longitudinal and transverse tectonic features and gradient of the river.
KeywordsPool-riffle Bank full Morphology Tectonic setting River meander
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