000 02711nam a2200397 4500
005 20260818095814.0
008 251197 th eng
035 _a.b10241711
099 9 _aAIT Thesis no. 232
100 1 _aCharng, Der-ruenn
245 1 0 _aEnergy dissipation in open channels by large semi-circular disk roughness elements
260 _aBangkok :
_bAsian Institute of Technology,
_c1969
300 _a66 p.
490 1 _aThesis ;
_vno. 232
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1969
520 _aThe study of flow resistance in very steep and rough open channels has direct application to many streams in the upper regions of a drainage basin. Steep channels, causing a high gradient flow in a very rough channel, also provide a means of using large roughness elements for energy dissipation. Flume tests were conducted using semi-circular disks as roughness elements. The disks were made of aluminum sheets. The relative depths investigated ranged from approximately 1 to 6. From the experimental results, no meaningful relationships could be found between the flow resistance C/ {u221A} g, the relative depth y/k and geometric parameters describing the channel shape. This indicated that other variables such as air entrainment and the Froude number of the flow, which were originally not considered to be significant, were important in describing the flow phenomenon.
650 0 _aHydraulics
700 1 _aAckermann, Norbert L.,
_eChairperson
700 1 _aFlammer, Gordon H.,
_eExamination Committee
710 2 _a Asian Institute of Technology,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. 232
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B24650
907 _a.b10241711
_bmnait
_cv
902 _a260702
998 _b3
_c951012
_dm
_ea
_fv
_g0
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c20
942 _c40
909 _aBarcode : 30050002898822
_bCREATED : 1994-05-17
_cRECORD # : i10295938
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050003093654
_bCREATED : 1994-05-17
_cRECORD # : i1029594x
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050160111737
_bCREATED : 2016-08-04
_cRECORD # : i12930209
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c37291
_d37291