RE: [Paddlewise] Eddy currents and down river racing

From: rebyl_kayak <rebyl_kayak_at_energysustained.com>
Date: Mon, 10 Aug 2009 22:32:13 +1000
G'day Craig and Matt, and many thanks for the comprehensive responses.

You both mentioned a prerace run. As the start of the Hawkesbury is a fair
distance away and the adverse current conditions will occur at the end of the
race I'll focus on the lower reaches of the river.

Craig those suggestions made a lot of sense. I hadn't thought about paddling
faster in adverse currents - it was non-intuitive for me being opposite to my
practise in gusts of strong wind, when I just try to hold position. But of
course you are right - current is quite different. The GPS will be very
valuable and I hadn't thought to check observations while watching the bow, it
will certainly make for a more interesting paddle.

One side of this particular river can sometimes be shallow and the other side
deeper, depending on which way the river bends, while the centre is invariably
deep, so I'll stay in the center of the river during ebb. The key question may
be whether to cut corners just a little in the flood tide, while staying away
from areas that are so shallow they cause drag, or if I have understood Matt
correctly to seek a possible counter current on the outer deep side of the
river bend.

Matt the down river race is invariably run on a night when the currents are
favourable at the start of the race, which means that really fast racing
classes can stay in sync with the current for long periods. The adverse flood
tide tends to be significant for the last few hours of the race, unless one is
very slow, so the possibility of counter currents is significant and I have
experienced them, more by good luck than judgement, in previous races.

BTW thanks for the comment that there were books on downhill river racing -
hadn't realised that and will seek them out.

All the best, PeterO
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Received on Mon Aug 10 2009 - 05:33:10 PDT

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