Re: [HOT] HOT: Glacial landslide dammed lakes
Dear All, Anyone interested in contributing to the glacial lake database on *OpenStreetMap* would do well to update the information available on the region's glacial lakes via ICIMOD. Follow this link http://apps.geoportal.icimod.org/glacierlakes/index.html, and you will find a ready-made inventory of the Hindu-Kush Himalayas. It has a vast repository of information, including the areas, altitude, length and classifications. The process may already be in place, to transfer this info onto OSM, so I'm sorry if this treads on toes, however, this is a great resource, and I'd encourage anyone who's been familiarising themselves with OSM for the past few weeks to try to get this information from one ICIMOD database into the more easily accessible OSM. Also, the top 21 most dangerous lakes can be found here ( http://geoportal.icimod.org/storymaps/nepalglakes/), with Tsho Rolpa, as mentioned previously, making top of the list. Check it out! You may find lots of the lakes have already been mapped, but any information you can add will always be of benefit! 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 06:56, 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
Re: [HOT] HOT: Glacial landslide dammed lakes
Dear Spring, I would agree, the less shadowing the better, but that is obviously a function of timing, the angle from which the image is captured, and then steepness of the relief... Based on the information I've examined before, there isn't much we can do, as we are at the mercy of the available data...I've not had a chance to check anything out specifically yet, so can't comment on the issues we may have in the Nepal dataset...however, anything is better than nothing... As soon as possible, we do need to try and get scouts reporting on the integrities of the dams, and (at best) surveying with drones and the like. However, I'm sure priorities are elsewhere and this will be slow to occur. 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 01:46, Springfield Harrison stellar...@gmail.com wrote: 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=0B3qRfjnIhqMhfm44dlZnM2x3Um1ia09mV2FwNHhLQmR2TDZKNVBaNFlyNENERkNZTkNmOU0usp=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=0B3qRfjnIhqMhfm44dlZnM2x3Um1ia09mV2FwNHhLQmR2TDZKNVBaNFlyNENERkNZTkNmOU0authuser=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
[HOT] HOT: Glacial landslide dammed lakes
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 the first person to identify all glacial lakes in the North Patagonian Icefield, Chile, 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
