Re: (XSS229/3A)/Channel Pattern & landforms -- GEOFORUM

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Date Posted: 10:43:17 08/31/99 Tue
Author: Michele
Subject: Re: (XSS229/3A)/Channel Pattern & landforms
In reply to: chenyee 's message, "Re: (XSS229/3A)/Channel Pattern & landforms" on 09:43:06 08/31/99 Tue

> > 1)Is this the rate that affects the rate of which
> > runoff increases downstream and the rate of the
> > sediment yield?
> >
> the predictable rate increases due to an increase in
> drainage area. a small river drainage pattern diagram
> would show the effects. by extending the river system
> to be examined, the drainage area would inevitably be
> enlarged. with an increase in area, runoff and
> sediment yield would be the two aspects affected. it
> is like nature's way of keeping balance.

Got it! Well-explained. It makes lots of sense :)
>
> > 2) Also , does permeablility of the underlying rock,
> > vegetation cover and climate play a part in
> > influencing this theory? In other words, does this
> > affect the predictable rate?
>
> this is a tough one. maybe the vegetation cover,
> underlying rock and climate do play a part. but their
> role is of such extensive cover that their effects are
> ingrained into that of the calculation of the
> predictable rate. meaning for example a vegetation
> cover indigeneous to our area of study of drainage
> basin may affect the runoff rate. but the predictable
> rate that increases will still be "predictable" in a
> sense when the area increases. this is because the
> vegetation cover itself is extensive throughout the
> whole map its effects on the runoff rate becomes a
> "constant" rather than a "variable" factor. finally,
> the predictable does not change.
>

THanks CHen yee.

I do wonder if Mr. John Hack had really taken all these factors into account. Then again, factors such as vegetation cover, climate and underlying rock structure can never be considered as "constant" features in the drainage basin area right? (esp. if we're looking at a large drainage basin area)

I think I would disagree on the bit about run-off being a "constant" rather than a variable and about the predictability being the same. THat is unless the "big guy" has taken all these into account.

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Replies:

Re: (XSS229/3A)/Channel Pattern & landforms -- Dr. Chatterjea, 19:58:51 09/07/99 Tue