Errata for “Flow-Boundary Effects on Critical Submergence of Intake Pipe” by Nevzat Yıldırım, Fikret Kocabaş, and Salih Cem Gülcan
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VIEW THE CORRECTED ARTICLEPublication: Journal of Hydraulic Engineering
Volume 133, Issue 4
The authors have unrealistically approximated that all common corner blockages of flow boundaries on the critical spherical sink surface (CSSS) are in the forms of complete spherical sector-surfaces, which are spherical wedge surfaces in reality. Therefore, the geometrical terms (representing, but not equal to, the common corner blockages of the flow boundaries in a rectangular canal with or without a dead-end wall), , , , , , and their equalities given in the paper must be corrected as explained in the following.
Corrections
Eq. (16) on page 291 should read aswhere FHG, , , , and are the common corner blockages of flow boundaries (spherical wedge surfaces) and submergence for the intake. If the conditions in Eq. (16) are not present, then FHG, , , , and are evaluated with an available computer-aided method or a graphical method. Or preferably, one can compute from continuity Eq. (1) on page 288 of the paper. Then, by means of a computer-aided method or a graphical method and a trial-and-error procedure, one can find (select until is satisfied).
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For a general correction, in all equations in the paper, the terms JH, , , , and must be replaced by FHG , , , , and respectively. Or replace with .
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After these corrections, JH, , , , and and their equalities as given in Appendix 1 of the paper, must be disregarded.
Consequences
For most of the experiments in the paper, since is always smaller than the radial distances of the intersection-corners of side walls, dead-end wall, and the canal bottom to the center point of the CSSS (or intake), [all common corner boundary blockages (spherical wedge surfaces) , , , , and are zero (absent). The conditions in Eq. (16) are present]. Only in some cases, FHG or JH is present but small ( or ). Therefore, the effects of the unrealistically approximated corner blockages of the flow boundaries on CSSS (hence on the computation of are not considerable when experimental and theoretical results are compared in the paper. If the corner blockages were large, they would cause considerable error. To see the effect of the error committed on the results, computed values of with error and correct forms in all tables given in the paper are compared in Fig. 1.
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© 2007 ASCE.
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Published online: Apr 1, 2007
Published in print: Apr 2007
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