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<[email protected]>
In-Reply-To: <[email protected]>
From: Sauhard Joshi
Date: Sun, 8 Nov 2020 08:46:06 +0545
Message-ID:
Subject: Re: Modelling a glacial lake outburst flood
To: “emilyrose [via HEC-RAS Help]”
Content-Type: multipart/alternative; boundary=”000000000000575c6c05b38faa01″–000000000000575c6c05b38faa01
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Content-Transfer-Encoding: quoted-printablehello,
actually I am doing thesis on GLOF as well. Is there anyway I could connect
with you? From what i read in your mail, I think you have a good
understanding of the hydrology of Glacier and having difficulty in
Hydraulic modeling. I have few queries about your inflow hydrograph . I
assume the lake to be reservoir of certain constant volume without inflow
and let it over top over the moraine dam. After reading your mail I think
your idea for inflow hydrograph seems more valid. Is you empirical formula
for discharge at outlet of the dam? or upstream of the lake?
Furthermore, if you need any information regarding my work, I will be happy
to share. Thank you.On Sat, Nov 7, 2020 at 10:42 PM emilyrose [via HEC-RAS Help] < [email protected]> wrote:
> Thank you so much for your reply!
>
> My thesis is assessing the hazard of a potential glacial lake outburst
> flood, so the rest of my thesis has assessed how the hazard has changed
> over the past decade, i.e. glacier area change, lake area and volume chan=
ge
> etc., I have also assessed how the vulnerability of the downstream
> community has changed in terms of population and infrastructure at risk. =
So
> the final step would be to tie this together which an estimation of how f=
ar
> an outburst of that size may travel etc.
>
> You are completely right, it is a lot to learn and I have very little
> knowledge on river hydraulics and flood modelling unfortunately, and
> neither does my supervisor but it is something I am being advised to do
> nonetheless – so I have been trying my best to teach myself the basics to
> complete this but it is rather complex to me.
>
> Most research within the field does use a dam-breach model, however, thes=
e
> are more complicated and as the aim of my project is not to assess how th=
e
> dam would breach I was hoping to do something as simple as possible. In
> terms of terrain, I have a modern DEM which I have produced a DTM in TIN
> format from (not sure if this is right), but using HEC-RAS I created a
> terrain from this which seemed correct.
>
> I have currently been doing a 2D unsteady flow simulation, using a flow
> hydrograph for the upstream, and normal depth for downstream. As a
> moraine-dammed lake it is assumed that flood discharge would increase
> linearly to a peak and decrease linearly to 0 m3/s over a time span equal
> to that of the rising limb – so the hydrograph is assumed to be triangula=
r
> in shape as has been applied to other GLOF studies. The peak discharge wa=
s
> calculated using Qmax=3D 0.72V^0.53, a relationship developed for
> moraine-dammed lakes.
>
> I managed to get this simulation up and running but even giving the
> hydrograph a duration of 8 hours the result in RAS-mapper is showing the
> flood to travel only ~30km downstream, when I want it to reach ~90km
> downstream to a large town. I am certain it would reach this far as there
> has been a flood from a nearby lake which reached the town that was a
> fraction of the size of the lake that I am modelling. I have no idea how
> to resolve this at all, I may have carried out the whole simulation out
> wrong but I am unsure how to make the flood continue further.
>
> I hope this makes some sense! Thank you for your time.
>
> ——————————
> If you reply to this email, your message will be added to the discussion
> below:
>
> http://hec-ras-help.1091112.n5.nabble.com/Modelling-a-glacial-lake-outbur=
st-flood-tp9330p9336.html
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Content-Transfer-Encoding: quoted-printablehello,actually I am doing thesis on GLOF as well. Is =
there anyway I could connect with you? From what i read in your mail, I thi=
nk you have a good understanding of the hydrology=C2=A0of Glacier and havin=
g difficulty in Hydraulic modeling. I have few queries about your inflow hy=
drograph . I assume the lake to be reservoir of certain constant volume wit=
hout inflow and let it over top over the moraine dam. After reading your ma=
il I think your idea for inflow hydrograph seems more valid. Is you empiric=
al formula for discharge at outlet of the dam? or upstream of the lake?Furthermore, if you need any information regarding my work, I will b=
e happy to share. Thank you.=C2=A0=C2=A0On Sat, Nov 7, 2020 at 10:42 =
PM emilyrose [via HEC-RAS Help] <[email protected]> wrote:<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
Thank you so much for your reply!=20
My thesis is assessing the hazard of a potential glacial lake outbu=
rst flood, so the rest of my thesis has assessed how the hazard has changed=
over the past decade, i.e. glacier area change, lake area and volume chang=
e etc., I have also assessed how the vulnerability of the downstream commun=
ity has changed in terms of population and infrastructure at risk. So the f=
inal step would be to tie this together which an estimation of how far an o=
utburst of that size may travel etc.=20You are completely right, it is a lot to learn and I have very litt=
le knowledge on river hydraulics and flood modelling unfortunately, and nei=
ther does my supervisor but it is something I am being advised to do noneth=
eless – so I have been trying my best to teach myself the basics to complet=
e this but it is rather complex to me.=20Most research within the field does use a dam-breach model, however=
, these are more complicated and as the aim of my project is not to assess =
how the dam would breach I was hoping to do something as simple as possible=
. In terms of terrain, I have a modern DEM which I have produced a DTM in T=
IN format from (not sure if this is right), but using HEC-RAS I created a t=
errain from this which seemed correct.=20I have currently been doing a 2D unsteady flow simulation, using a =
flow hydrograph for the upstream, and normal depth for downstream. As a mor=
aine-dammed lake it is assumed that flood discharge would increase linearly=
to a peak and decrease linearly to 0 m3/s over a time span equal to that o=
f the rising limb – so the hydrograph is assumed to be triangular in shape =
as has been applied to other GLOF studies. The peak discharge was calculate=
d using Qmax=3D 0.72V^0.53, a relationship developed for moraine-dammed lak=
es.=20I managed to get this simulation up and running but even giving the=
hydrograph a duration of 8 hours the result in RAS-mapper is showing the f=
lood to travel only ~30km downstream, when I want it to reach ~90km downstr=
eam to a large town. I am certain it would reach this far as there has been=
a flood from a nearby lake which reached the town that was a fraction of t=
he size of the lake that I am modelling.=C2=A0 I have no idea how to resolv=
e this at all, I may have carried out the whole simulation out wrong but I =
am unsure how to make the flood continue further. =C2=A0I hope this makes some sense! Thank you for your time.=20
=09
=09
=09
If you reply to this email, your message =
will be added to the discussion below:–000000000000575c6c05b38faa01–
Sauhardra JoshiParticipantThis is the screenshot of the code.
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