Further to my previous . . . Due to the high relief in the risk area, high off-nadir angle imagery may be less useful. There may be too much distortation or obscured areas.
On the other hand, are there other choices? Cheers . . . . . Spring Samsung Tab 4 On May 13, 2015 9:49 AM, "Sam Inglis" <sam.ing...@gmail.com> wrote: > Dear Steve, > > I worked for Professor John Reynolds, the man who led the research which > revealed the instability of the dam at Tsho Rolpa. I have read about the > site extensively in his company archives, which was conducting research > there from at least 1998, to present I believe. > > He is convinced that Tsho Rolpa is the far more dangerous of the two > majorly dangerous glacial lakes in Nepal, the other being Imja. I would > certainly encourage a very close examination of the region - in particular > there is an ice-core, which has been melting for some time, in the terminal > entraining moraine dam - if I remember correctly, it is at the southern end > (the terminus), under the northwestern section of the dam. If there is any > sign of water seeping from the dam itself, or any slumping in that > section...I would recommend some very drastic and rapid movements to get > people moving from downstream. > > Any destabilisation of surrounding slopes, or cracking of the glacier > snout are other things to look out for. > > I have loaded one of his many papers on the region, "*Glacial hazard > assessment at Tsho Rolpa, Rolwaling, Central Nepa*l", into my Google > Drive folder for your reference ( > https://drive.google.com/folderview?id=0B3qRfjnIhqMhfm44dlZnM2x3Um1ia09mV2FwNHhLQmR2TDZKNVBaNFlyNENERkNZTkNmOU0&usp=sharing > ). > > There are a large number of papers assessing the potential, identifying > what to look for, etc. > > If you have specific questions, I'm always happy to help and, as suggested > before, would consider throwing together a quick handbook to help with > identification of the key risks. > > Thanks, > > > Sam Inglis MSc > > <http://hk.linkedin.com/in/saminglis/> > <https://www.facebook.com/sam.inglis.92> > <https://twitter.com/the_ice_man_24>[image: +852 6036 8750] > <(+852)+6036+8750>[image: sam_urai_24] <sam_urai_24> > > On 14 May 2015 at 00:25, Steve Bower <sbo...@gmavt.net> wrote: > >> Tsho Rolpa, northern Dolakha district, is another glacial lake renowned >> for having an unstable natural dam, putting thousands at risk downstream. >> >> http://www.bigmaybe.com/learn?s=Tsho_Rolpa >> >> Perhaps there is an existing assessment of natural dams at risk of >> failing. >> >> Steve >> >> On Wed, May 13, 2015 at 10:59 AM, Sam Inglis <sam.ing...@gmail.com> >> wrote: >> >>> Dear All, >>> >>> I agree totally, the hydropower issues are enormous - a very important >>> case study of the 1985 Dig Tsho glacial lake disaster, studied by Vuichard >>> & Zimmerman in 1987, revealed the destructive potential of Glacial Lake >>> Outburst Floods (GLOFs) and LLOFs. >>> >>> Please see via: >>> https://drive.google.com/open?id=0B3qRfjnIhqMhfm44dlZnM2x3Um1ia09mV2FwNHhLQmR2TDZKNVBaNFlyNENERkNZTkNmOU0&authuser=0 >>> >>> I would be happy to scan the satellite imagery for viable sites, but the >>> main issue is LLOFs (Landslide-dammed Lake Outburst Floods) in the >>> immediate future. In order to identify these, the HOT team needs to make >>> current satellite imagery available (my apologies if this has already been >>> done). >>> >>> I am also quite busy at the moment, and very sadly (selfishly) cannot >>> commit to mapping the situation in the next day or so. However, the key >>> things to be looking out for are* landslide-dammed lakes*. They are >>> highly destructive, enormously unstable, filled by glacial melt waters, >>> debris, rainwater, and anything else entrained by the waters, and very >>> deadly. >>> >>> These features form very rapidly - a 6km lake formed and burst within a >>> couple of days along the Sutlej River, due to a combination of internal >>> pressure (the river has a naturally high discharge rate), compounded by a >>> cloudburst. >>> >>> Also keep an eye out for shifting glaciers, as their migrations will >>> release sub- or englacial (internal) meltwater - the slipping of glaciers >>> down valley may have blocked sections of rivers, and would create very >>> dangerous situations. >>> >>> I could try and come up with a brief handbook on what to look out for, >>> so that the features can be identified, in the next 4 days? If this >>> agreeable, someone should just give me an idea of what the team needs, and >>> I'll work to spec! >>> >>> Thanks, >>> >>> Sam Inglis MSc >>> >>> <http://hk.linkedin.com/in/saminglis/> >>> <https://www.facebook.com/sam.inglis.92> >>> <https://twitter.com/the_ice_man_24>[image: +852 6036 8750] >>> <(+852)+6036+8750>[image: sam_urai_24] <sam_urai_24> >>> >>> On 13 May 2015 at 14:36, amrit karmacharya <amrit...@gmail.com> wrote: >>> >>>> hi sam >>>> >>>> all of the hydropower plants in nepal are dependent on glacial rivers. >>>> is it possible to identify lake formation and bursting in the areas >>>> upstream of these powerplants? losing power source would be terrible. >>>> On 13 May 2015 04:44, "Robert Banick" <rban...@gmail.com> wrote: >>>> >>>>> Hi Sam, >>>>> >>>>> I think honestly you’re better placed to tell us how you can help than >>>>> the other way around. Most of us aren’t glacial lake experts :-) >>>>> >>>>> My first thought is that you can trace lakes in the affected areas >>>>> into OSM. The second would be to help us understand what, if any, risks >>>>> can >>>>> result from lakes being dammed by landslides. Are there risks associated >>>>> with eventual bursts? Do we need to create data in OSM and then try to >>>>> model these risks in GIS software packages? >>>>> >>>>> You tell us! >>>>> >>>>> Cheers, >>>>> Robert >>>>> >>>>> — >>>>> Sent from Mailbox <https://www.dropbox.com/mailbox> >>>>> >>>>> >>>>> On Tue, May 12, 2015 at 2:10 AM, Sam Inglis <sam.ing...@gmail.com> >>>>> wrote: >>>>> >>>>>> Dear HOT Team, >>>>>> >>>>>> My name is Sam Inglis, and my background is in glacial lake >>>>>> detection, identification and mapping, and was the first person to >>>>>> identify >>>>>> all glacial lakes in the North Patagonian Icefield, Chile. I am familiar >>>>>> with Himalayan mountain ranges, and studied large swathes of the >>>>>> Indo-Tibetan catchment of the Sutlej River, which runs from near Mt >>>>>> Kailash, transects Himachal Pradesh, and terminates in Pakistani >>>>>> territory. >>>>>> >>>>>> I have previously not engaged much in communal, open-source, reactive >>>>>> disaster mapping, but have been adding to the OSM database in Nepal >>>>>> sporadically over the past two weeks, when time has permitted. >>>>>> >>>>>> Yesterday, I saw that NASA had posted an article >>>>>> <http://was%20the%20first%20person%20to%20identify%20all%20glacial%20lakes%20in%20the%20North%20Patagonian%20Icefield,%20Chile,> >>>>>> on the formation of landslide-dammed lakes along Nepal's rivers, near >>>>>> Gorkha, and was wondering how I can best contribute to enhancing the >>>>>> understanding of the features? How can I help with such hazard detection >>>>>> & >>>>>> analysis? >>>>>> >>>>>> Thanks, and I look forward to hearing back from you and the team! >>>>>> >>>>>> Keep up the great work! >>>>>> >>>>>> Sam Inglis MSc >>>>>> >>>>>> <http://hk.linkedin.com/in/saminglis/> >>>>>> <https://www.facebook.com/sam.inglis.92> >>>>>> <https://twitter.com/the_ice_man_24>[image: +852 6036 8750] >>>>>> <(+852)+6036+8750>[image: sam_urai_24] <sam_urai_24> >>>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> HOT mailing list >>>>> HOT@openstreetmap.org >>>>> https://lists.openstreetmap.org/listinfo/hot >>>>> >>>>> >>> >>> _______________________________________________ >>> HOT mailing list >>> HOT@openstreetmap.org >>> https://lists.openstreetmap.org/listinfo/hot >>> >>> >> > > _______________________________________________ > HOT mailing list > HOT@openstreetmap.org > https://lists.openstreetmap.org/listinfo/hot > >
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