Been in the Harbor of New York with a small boat and and and . Yesterday crossed the Harbor of New York on the Staten island Ferry . In the pass we had wet lands that a damper on high tides / storm surges etc. . I believe at US Government levels restoring such good . Your views sought .
Original Message:
Sent: 07-08-2023 10:04 AM
From: William McAnally
Subject: Modeling unsteady flows in large scale rivers with secondary flows
I agree. Rising Tide is a marvelous book and rightly proclaimed one of the 50 best books of the past 50 years.
One issue that Barry doesn't get quite right is the argument for and against levees. He oversimplifies the arguments. Charlie Little and David Biedenharn , river engineering experts, have said that are "many simple, easy to understand AND WRONG methods to control rivers." At one point Barry acknowledges that it's a complicated set of issues but he doesn't adequately convey those complexities to the reader.
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William McAnally Ph.D., P.E., D.CE, D.NE, F.ASCE
ENGINEER
Columbus MS
Original Message:
Sent: 07-07-2023 07:43 AM
From: Ushakar Jha
Subject: Modeling unsteady flows in large scale rivers with secondary flows
Rising Tide- The Great Mississippi Flood by John Barry is really intriguing to understand the history of world's one of the largest rivers and attempts to tame the river. As a primarily hydraulics engineer, I'm amazed by John Barry has explained river flow complexities without going into modeling.
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Ushakar Jha P.E., M.ASCE
V.P. of Project Engineering
Rye Development
Winchester MA
Original Message:
Sent: 01-14-2023 03:18 PM
From: Ebissa Gadissa
Subject: Modeling unsteady flows in large scale rivers with secondary flows
One of the most interesting studies in Hydraulic Engineering is modeling unsteady flows in complex flow conditions. In unsteady flow conditions, the main channel may not be enough to carry the released discharge or flood. Thus, floodplains can be constructed with different structures and roughnesses as per required to minimize the effect of floods. In this condition, the secondary flow term is one of the key parameters to be estimated or simulated. what is secondary flow? what is the most method to estimate secondary flows? can we observe the secondary flows in the large rivers practically? any current findings about secondary flows except SKM? Any comments or suggestions are welcome!
'' With Regards''
Ebissa, S.M. ASCE
PhD Scholar in Hydraulic Engineering
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Ebissa Gadissa S.M.ASCE
PhD Scholar
Addis Ababa
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