Your search found 3 records
1 Memon, M. K.; Ahmed, S. U.. 1993. Design of vortex tube sediment ejectors for the Jamrao Canal. In Government of Pakistan-USAID Irrigation Systems Management Research Project; IIMI, Proceedings: Irrigation Systems Management Research Symposium, Lahore, 11-13 April 1993. Vol.V. - Groundwater and physical hydraulic modeling. pp.35-49.
(Location: IWMI-HQ Call no: IIMI 631.7.8 G730 IIMI Record No: H012901)
The Jamrao Canal takes water from the Nara Canal at the Jamrao weir, 180 km from Sukkur Barrage on the River Indus. For the past 60 years, bed levels in the head reaches of the Jamrao Canal have reported a rise of about 8.0 ft. There is a proposal to increase the design discharge of the Nara Canal from 10,000 cusecs to 18,000 cusecs and of the Jamrao Canal from 4500 cusecs to 5700 cusecs. The channels are suffering badly from sediment deposits. The Jamrao Canal is to be twinned. The possibility of returning water to the Canal system and the availability of 3.5 m (11.25 ft) head of water has made the use of vortex tube sediment ejectors feasible for both the Jamrao Canal and its twin. Extracted sand will be trapped in a settling basin and pumped out by dredger to a disposal area. A few experiments were carried out on a physical model to confirm the performance of the design of vortex tubes, the transition structure located between the outlet pipes and settling basin, and self cleaning of the sediment deposits in the tubes.
2 Memon, M. K.; Ahmed, S. U.. 1993. Effects of downstream glacis slope on scour. In Government of Pakistan-USAID Irrigation Systems Management Research Project; IIMI, Proceedings: Irrigation Systems Management Research Symposium, Lahore, 11-13 April 1993. Vol.V. - Groundwater and physical hydraulic modeling. pp.51-71.
(Location: IWMI-HQ Call no: IIMI 631.7.8 G730 IIMI Record No: H012902)
One of the important causes of failure of hydraulic structures is the development of scour below the downstream pavement. For a good design, it is essential that the scour depth is minimized. The main objective of this study is to know the effect of downstream glacis slope on scour below a hydraulic structure. The glacis has to conduct water of high energy level at the crest to the lower energy level downstream of the weir smoothly and without any impact. A hydraulic jump is allowed to form on the glacis slope to dissipate the energy within a short length of the pavement. A physical model study was carried out by changing the glacis slope and other hydraulic parameters. An experimental channel of head discharge in the range of 5-6.5 cusecs combined with a fall was constructed at the laboratory. Hydraulic relations were evolved relating the parameters of scour depth, discharge intensity, specific energy, length of jump and depth of flow. Qualitatively speaking, it appears from the results that length of trough increases with the flatness of the glacis slope while the scour depth decreases below the structure.
3 Islam, M. S.; Ahmed, S. U.. 2001. By-catch mortality during collection of Penaeus monodon (FAB.) post-larvae from the rivers of Khulna, Bangladesh. Journal of National Science Foundation Sri Lanka, 29(3-4):107-115.
(Location: IWMI-HQ Call no: P 6560 Record No: H033023)
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