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Geomorphology

Geomorphology

ECS Events @EGU2018

Finally, the EGU general assembly is starting today. In order to give you some guidance what important events you should definitely not be missing out on, the ECS representatives (Micha Dietze and Annegret Larsen) put together this very nice timetable:

EGU – realm and maze?

– written by Micha Dietze, Annegret Larsen (both GM Early Career Representatives), and Anouk Beniest (EGU TS Early Career Representative)

An interview with the Susanne Buiter, the current chair of the EGU Programme Committee

Susanne Buiter is senior scientist and team leader at the Solid Earth Geology Team at the Geological Survey of Norway. She is also the chair of the EGU Programme Committee. This means that she leads the coordination of the scientific programme of the annual General Assembly. She assists the Division Presidents and Programme Group chairs when they build the session programme of their divisions, helps find a place for new initiatives and tries to solve issues that may arise. This also includes short courses, townhall and splinter meetings, great debates, events on arts and other events. The programme group also initiates discussions on how to include interdisciplinary or transdisciplinary science and how to accommodate the growth of the General Assembly.

Susanne, you are perfect example of a scientist bridging scientific work with scientific management. What brought you to this and how do you manage keeping the balance?

Susanne Buiter senior scientist and team leader at the Solid Earth Geology Team at the Geological Survey of Norway.

I would not call it perfect! And I find it not so easy to keep a balance. I am very fortunate that my employer, the Geological Survey of Norway, recognises the importance of organisations like EGU for the geoscience community in Europe. That means that I can partly use working hours for EGU activities and that is a great help. For me, EGU fulfils an important task in bringing people together for networking, starting new projects, discuss new ideas and I would like to contribute to making that possible. I guess one thing led to the other, but what is important for me is that all activities are truly fun and rewarding.

It seems you have filled almost all the different possible jobs within the EGU: giving talks, discussing posters, judging presentations, convening sessions, coordinating ECS activities like short courses, acting as Programme Group member and leader, serving as TS Division President, and now working as Programme

Committee Chair. Could you describe what the main goals of the EGU are for you, and what brought you to become such an active member of the EGU community?

I see the role of EGU as serving the geoscience community through enabling networking, discussions and information sharing. Our General Assembly is very important for this and also our journals. I love the outreach and education that EGU does, through the GIFT programme and attempts to interact with politics and funding agencies. By the way, the short courses are for and by all participants, including the ECS, but not only!

Could you shed some light on the structure of this big ship called EGU in a few sentences?

What characterises EGU is that the union is by the community and for the community. EGU has a small office in Munich that oversees the day-to-day operations and coordinates our media activities (www.egu.eu). They are also EGUs long-term memory. We have 22 divisions from Atmosphere Sciences AS to Tectonics and Structural Geology TS. The division presidents are usually also chair of their associated Programme Group, with the same abbreviations AS, BG, CL etc that you see in our programme at the General Assembly in Vienna. They schedule their parts of the conference programme. For this, programme group chairs rely on the work of conveners (you!) to propose and organise sessions. Division presidents are also member of EGU’s council, together with EGU’s executives. Here decisions are taken on budgets, committee work, new executive editors of journals etc. EGU has among others committees for awards, education, outreach, publications and topical events (https://www.egu.eu/structure/committees/). Copernicus is hired by EGU for organisation of the General Assembly and publication of the 17 journals (https://www.egu.eu/publications/open-access-journals/). All EGU journals are open access. Sorry, that was rather more than a few sentences…

How flexible – in your experience – is the EGU administration and organization on a scale of 1-10?

A 9! I would have like to say a 10, but improvements are always possible. The EGU office, executives, divisions and committees put a lot of effort in coordinating all activities. We actually rely on flexibility as EGU is bottom-up. This is also how new initiatives find a place. For example, EGU2018 will have a cartoonist-in-residence and a poet-in-residence, a new activity I am very excited about and that was proposed by participants.

Regarding the ECS, which role do you feel should they play at EGU level? What is running very well and what would you like to change? Where do you think are fields where you see opportunities to become more active?

About half of participants to our General Assembly identify as ECS according to the survey from 2017 and abstract submission statistics for 2018. So they should play an important role! Not only in the General Assembly, but also in our committees. The ECS representatives are important for their feedback to council, making the ECS opinions heard, and starting new activities, such as the networking reception, many short courses, and the ECS lounge. What I would like to change? More ECS session conveners please! I would really like to encourage ECS to submit session proposals during our call-for-sessions in Summer. And please consider to submit your abstract with oral preference, so conveners can schedule ECS talks.

What is most important for ECS to know about the EGU structure?

Know your ECS representative. At the General Assembly, come to the ECS forum on Thursday at lunch time and the ECS corner at the icebreaker. Connect with scientists in your division(s) by attending the division meeting.

From your perspective, what can we do to motivate more ECS to actively shape “their” EGU?

It is building on what you already do: share information on EGU, the divisions, that we are bottom-up and therefore rely on suggestions by community members. Encourage ECS to suggest sessions, volunteer as committee member when there are vacancies (these are advertised on www.egu.eu and through social media), and organise activities at, before and after the General Assembly. Encourage ECS to use the conference in Vienna to network with all participants, not only through ECS channels, and find new opportunities that way. My observation is that many experienced scientists love to discuss with ECS and perhaps even start new collaborations.

Which ways and approaches do you see to better connect ECS within and between Programme Groups?

I find especially connections *between* Programme Groups very interesting, not only for ECS. EGU is growing to a size that it has become more difficult to find time to look outside your own bubble. We have been investigating ways to make our programme more interdisciplinary (https://meetingorganizer.copernicus.org/EGU2018/sessionprogramme/IE) and perhaps in the future also transdisciplinary, to try to create new approaches. That said, I am happy to see at the ice-breaker and networking reception that many ECS identify with more than one division! It is important to cross borders, that is where a lot of exciting research happens.

The mentoring programme is a rather new feature for many divisions. Could you give some feedback on how it went last year? Will it be a permanent item during the EGU General Assembly?

We organised the mentoring programme in 2017 as a pilot, which we on purpose kept somewhat low profile to generate feedback and develop our tools. We see the programme as a networking opportunity for both first-time and experienced attendees. Feedback was very positive, so we are rolling out in full this year. We offer matching, two meeting opportunities at the General Assembly and some guidance (https://www.egu.eu/outreach/mentoring/).

The EGU General Assembly can be overwhelming at first. What would you advice young (and not so young) researchers to do to have a successful meeting?

Attend short course SC2.1 on how to navigate the EGU (Monday at 08:30), read the first-timer’s guide to the General Assembly (https://blogs.egu.eu/geolog/2017/11/29/a-first-timers-guide-to-the-2018-general-assembly/), and make sure you are on the mailing list for your division ECS representatives if they have one. Some divisions have an ECS evening event, do attend! Consider taking part in the mentoring programme of course. And prepare a personal programme before heading to Vienna. Not to follow it in detail, but at least to know where to go for talks, PICO, short courses, posters, and events. I would definitely use the General Assembly to talk to other participants, this is a great chance to expand your network.

Time and space are precious during the EGU General Assembly. There are over 10.000 contributions, many aiming at a talk, but ending up as posters, the session rooms are often overcrowded, the lunch break brings a rush and long queues. Is there any way the Union Council considers to improve certain bottle necks or are we already at the maximum of optimizing some of the conference logistics?

In 2017, we had ca. 17,400 presentations and 14,500 participants. We rented a new hall on the forecourt of the conference centre, which we will also have in 2018. This increased the conference space, taking pressure off the rooms and surely reduced queues. Copernicus and EGU work continuously on optimising the scheduling. We also started a broader discussion on future formats of the General Assembly. I would like to take this opportunity to encourage trying a PICO presentation or convening a PICO session. I have run some poster-only sessions the last years, which have been great fun as we had so much better time for discussions.

Many ECS approach their representatives because they are worried or disappointed to see their initiatives for scientific session proposals not succeeding. Instead they find year after year the same names behind established and crowded sessions. Do you have any advice how to deal with this or do you think this is not really an issue?

I am aware that this may unfortunately play for some sessions, but overall I think we cater well to new initiatives. My advice to Programme Group chairs is to encourage ECS conveners for new sessions and also to include ECS as part of long-running sessions that should rotate, and renew, conveners each year. Our General Assembly offers place for sessions on the basics and fields that require long-term developments, and at the same time also on new, emerging topics. Sometimes these sessions on upcoming topics may be small in number of submissions, but large in attendance. The best I can say to anyone is to discuss concerns or feedback regarding convening with the division president and the ECS division representative.

With the growing amount of members and participants (almost) every year, how do you see the EGU’s future both as a community and as one of the most important events?

EGU is an important voice of the Earth and space science community in Europe. I think the union should continue to do what it is good at: providing a platform for networking, discussions on new and old fun topics, and information sharing. I would like EGU to stay flexible and cater to new formats in its journals and at its General Assembly, the latter also in light of discussions on CO2 costs of meetings.

Thank you Susanne!

Could I emphasize again that EGU is bottom-up and depends on input from our communities? So please contact your ECS representative, the division president or me (programme.committee@egu.eu) with ideas and feedback!

Some more information online here:

www.egu.eu

https://meetings.copernicus.org/egu2018/information/programme_committee

https://www.egu.eu/gm/home/

https://www.egu.eu/gm/ecs/

http://www.geodynamics.no/buiter/

– written by Micha Dietze, Annegret Larsen (both GM Early Career Representatives), and Anouk Beniest (EGU TS Early Career Representative)

 

A geomorphologist’s winter refuge

– written by Michael Dietze, GFZ Potsdam –

The Sävor River, northern Sweden, under late winter conditions. The frozen river has been sensed by ADCP and seismometers to constrain flow properties and bedload transport dynamics (credit: Michael Dietze).

Why Swedish, Finnish and German geomorphologists meet in the boreal zone to drill holes into icy rivers and frozen ground.

There are many ways to counter the lazy days between Christmas and the EGU meeting. One of the more promising ones is this: think of doing collaborative field work in February, in northern Sweden, on and around a frozen river. This is what Lina Polvi, Lovisa Lind (both Umeå University), Eliisa Lotsari (University of Eastern Finland), Jens Turowski and Michael Dietze (both GFZ Germany) decided to do. They met in Umeå, northern Sweden, at 64° North – just when the thermometer had recovered from its chilling excursion down to -25° C back to a cozy -12° C – to investigate how much and how fast water flows under an ice-covered high-latitude stream, and by which mechanism and how much sand and gravel are transported in these northern rivers during the cold period of the year.

Lina drilling a hole through half a meter of river ice to sense the stream properties (credit: Eliisa Lotsari).

We all know that bedload transport is a key process in rivers, affecting nutrient transport, habitat availability and hazard potential of streams. Yet, currently, in northern regions, scientists are virtually blind-folded for almost half a year when thick ice cover precludes the view to the hydrodynamic processes in channels, and traditional survey and monitoring methods are unavailable. So, how do you measure flow velocity and bedload transport when your research object is hidden below half a meter of compact ice? Well, at least the hydraulics are quite easy: flow velocity can be measured with an acoustic doppler current profiler (ADCP), a device that can measure bed topography and flow velocity in three dimensions in the entire water column. In the summer the ADCP can be towed across the stream on a small raft, but in winter in a frozen river, it needs to be lowered into holes drilled through the ice. And even in the 21st century, a few days before women’s day, the staff at the fishing shop that rented out the motorized ice auger felt the need to carefully and skeptically explain to the women that an ice auger is a “very powerful and dangerous thing”. The three female scientists politely expressed their gratefulness for the concern, pointed out their prior experience, and hired the machine anyway.

Letting the sensors doing their work. Lovisa, Jens and Lina observing an ADPC measuring hydraulic conditions under ice (credit: Eliisa Lotsari).

Packed with the auger, ADCP, geophones and seismometers, a scary ice saw, red spray paint, a GoPro camera, time-lapse cameras, and plenty of duct tape, all five river scientists trudged through the meter deep snow with snowshoes along the bank of the Sävar River until they found a reach with ice thick enough to walk on. How do you recognize that it is thick enough? Well, you may be less careful, but our heroes used a well-known and long-established Swedish testing device with a mass of 400 kg: the moose. Seeing moose tracks in the snow on top of the river ice is always a good sign that it is safe to walk on. Before the first measurement could be made, around 20 holes with a diameter of 20 cm needed to be drilled through 50 to 80 cm thick ice. This was shared fun and with the last ice layer collapse, as the dark brown river water seeped up to the surface, the site was ready for the ADCP surveys, water sampling and underwater videos with the GoPro camera.

Letting the sensors doing their work. Lovisa, Jens and Lina observing an ADPC measuring hydraulic conditions under ice (credit: Eliisa Lotsari).scary ice saw, red spray paint, a GoPro camera, time-lapse cameras, and plenty of duct tape, all five river scientists trudged through the meter deep snow with snowshoes along the bank of the Sävar River until they found a reach with ice thick enough to walk on. How do you recognize that it is thick enough? Well, you may be less careful, but our heroes used a well-known and long-established Swedish testing device with a mass of 400 kg: the moose. Seeing moose tracks in the snow on top of the river ice is always a good sign that it is safe to walk on. Before the first measurement could be made, around 20 holes with a diameter of 20 cm needed to be drilled through 50 to 80 cm thick ice. This was shared fun and with the last ice layer collapse, as the dark brown river water seeped up to the surface, the site was ready for the ADCP surveys, water sampling and underwater videos with the GoPro camera.

Installation of a seismic station to sense hydraulic and sediment transport dynamics of the Sävar River by Micha (credit: Eliisa Lotsari).

Meanwhile, Micha left the slippery ground to explore the bank and terrace landforms around the measurement site. He scouted for suitable locations to deploy geophones and seismometers. Geophysical instruments designed for earthquake analysis in a study about fluvial geomorphology? Indeed, seismic sensors are ideal for gathering information about hydraulic dynamics and sediment transport where other systems would simply fail. The instruments are sensitive enough to record the impacts of the smallest rain drops, and they deliver precise estimates of the seismic wave field emitted by the turbulence of the water and pebbles being dragged over the river bed. And crucially, they do not need to placed within the river, but can monitor everything comfortably from the bank. Three geophones were installed along a line perpendicular to the river, and one broadband seismometer some 30 m upstream. The instruments need to be installed in a hole in the ground, half a meter deep. Luckily, the ground was not frozen throughout, as suspected, and the loose sand beneath a surface layer of only 10 cm of frozen soil was easy to remove. The charcoal brought to defrost the ground was put to good use in a barbecue at lunch time. The sensors were leveled in the holes, oriented to North, connected to the data loggers and the station was ready to record 1000 samples per second for the next month, until the batteries need to be exchanged by Lina and Lovisa.

The seismic sensor network forms a triangle that allows for not only constraining water flow and sediment transport, but also locating seismic point sources, such as cracking in the ice. This latter functionality will become especially interesting when, in late spring, the frozen surface of the river cracks open and potentially an ice jam forms while a flood rushes through the valley. The combined information on timing and location of single events allows detailed insight to the anatomy of this seasonal singularity.  Furthermore, the seismic survey allows inferring the seismic signature of such ice break-up events, along with precursor activity like small cracks that compensate the increasing tension within the ice cover.

Spectrogram of two days of seismic recording. River turbulence is visible around the 10 Hz band (continuous yellow band), the activity period in early morning of 7 March presumably represents an ice break-up event 100 m downstream the installation, and the high frequency activity is caused by wind, interacting with the trees (credit: Michael Dietze).

The field team (Jens, Micha, Lovisa, Lina and Eliisa, from left) enjoying a winter barbecue after successful installation (credit: Eliisa Lotsari).

After two chilly days in the field most of the work is done, the seismic network is ready to operate, the ADCP data is already processed and the team is improvising to enjoy a winter barbecue, chatting about when to meet again to recover the equipment, bring together the data output and share ideas for the follow-up project.

Interested in more high latitude fluvial dynamics, bedload transport and environmental seismology? Approach the team members at the upcoming EGU meeting in Vienna or see the individual web pages:

Lina, Lovisa, Eliisa, Jens and Micha

 

– written by Michael Dietze, GFZ Potsdam –

OCTOPUS: An Open Cosmogenic Isotope and Luminescence Database

OCTOPUS: An Open Cosmogenic Isotope and Luminescence Database

– written by Henry Munack, University of Wollongong –

In geomorphology, radiometric dating methods have been on the rise during the past decades. Notably cosmogenic nuclide applications and luminescence dating gained great popularity because they quantitatively capture geomorphic processes on their process-inherent timescales.

To date, globally more than 4,200 in situ detrital catchment-averaged 10Be data are available, forming a highly variable, statistically resilient dataset that represents substantial effort of both capital and labour.

However, published data are often still inaccessible to researchers, are frequently subject to lacking crucial information, and are commonly different in underlying calculation and standardisation algorithms. Resulting data disharmony has confounded the purposeful (re)use of published 10Be-derived data, for instance for inter-study comparison, for looking at the greater picture of Earth surface’s downwearing or for innovative data revaluation.

Aiming to do away with these problems, OCTOPUS: An Open Cosmogenic Isotope and Luminescence Database has been made available online under the lead of the University of Wollongong (UOW) and with support from the Australian National Data Service (ANDS). Data are hosted and maintained at UOW and are available to the research community via an OGC compliant Web Map Service.

The cosmogenic radionuclide part of the database consists of 10Be and 26Al measurements in fluvial sediment samples along with ancillary geospatial vector and raster layers, including sample site, basin outline, digital elevation model, gradient raster, flow direction and flow accumulation rasters, atmospheric pressure raster, and nuclide production scaling and topographic shielding factor rasters. The database further includes comprehensive metadata and all necessary information and input files for the recalculation of denudation rates using CAIRN (Mudd et al., 2016), an open source program for calculating catchment-averaged denudation rates from 10Be and 26Al data.

The luminescence part of the database consists of thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements in fluvial sediment samples from stratigraphic sections and sediment cores from across the Australian continent and includes ancillary vector and raster geospatial data.

OCTOPUS can be accessed at: https://earth.uow.edu.au

A manuscript describing the database in detail is available from the open access journal Earth System Science Data (Discussions). The preprint is now accessible and open for interactive public discussion until 01 May 2018 at: https://www.earth-syst-sci-data-discuss.net/essd-2018-32/

You are invited to download the data and take part in the discussion.

– written by Henry Munack, University of Wollongong –