GeoSci.xyz GWB Lectures, 3 Feb 2020

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From YouTube: 2020 02 03 Day1 Part2 Introduction2

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In this video we define the goals of the Geophysics Without Boarders (GWB) project and outline the content that will be taught during the short course.

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This is also meant to be the characteristic picture. It's not exact. We just need something that approximately works and you've got an upper aquifer here and alluvium. This region could be quite dry or it could be underneath you may have a clay aquitard, and then you have bedrock basement rocks granite. That could be fractured and.

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Sometimes you might be concerned with the upper aquifer, perhaps sometimes also when this dries up, then you want to find this lower aquifer. That means that you need to drill deeper and you need to decide where to drill the blue situation service. So there's the deeper that.

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So here's our project plan, our approach is- is the following: that we want to train the local state water stakeholders here, that's the DRD and the university about the problem of finding water and how to how to use geophysical equipment most effectively. We want to provide online training materials by online I mean computer access.

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We want to bring modern, DC equipment to Mon State. That's what that box is we're going to do. Dc surveys and hopefully up to maybe 20 villages in one state, will provide open source software to analyze the data to process the data and visualize it and then ultimately drill wells based on DC interpretation. So.

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Important part of this picture here is that you notice that the earth is not layered in its entire width. This sound aquifer stops in the top and in the bottom, the deeper aquifer isn't here. It only starts here, so the earth is not one-dimensional. It's not laterally continuous, so.

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With the new equipment we're going to collect data, that's very different than what you usually collect, and it's going to allow us to make a picture of the earth that looks perhaps something like this. It changes from the left side so from here to here. It's it's different. The earth changes as we go along. This is the horizontal direction and things are changing both vertically and horizontally. So.

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If you drilled a well here and you hit water, that doesn't mean I can go 100 feet this way and drill and hit water, because the earth has changed.

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Is it okay? So what we're looking at this is a picture of electrical resistivity. Okay and the color blue does not reflect water.

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That's that's fine, so this is just this is at this point, a picture we're going to work with pictures like this and look at the electrical resistivity of the earth and try to make a geologic and at a hybrid geologic interpretation. So.

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So our overall project goals from the GWB orgy scientists, Without Borders, is to help you transition from the many hand-dug Wells in shallow at first to trap, to go from that to digging deeper wells to find the aquifers that are at death of higher capacity and higher water quality. So.

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We want to combine the geophysics and the groundwater hydrology together, because they, this is a problem that requires geology, hybrid geophysics and geophysics work.

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Could have success and for that we need education, resources and tools to work.

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First want to give you some background about this project.

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There was a kusa project in 2018 and Kevin fan was here. He was a volunteer geophysical survey, trainer and consultant.

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Catherine presented a course on the DC resistivity method, so he had people he was teaching. He built his own instrument. He collected data I, don't know whether that person should use luckily she's, not here, and then he learned to process and interpret the data. So.

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And here is an example of what he was able to do and we are going to repeat this.

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Is taking data at the local park and these were the data that were acquired. It was a slumber, chez sounding and then those data were interpreted to give a low resistivity unit, which was interpreted as an aquifer and above ten meters depth.

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So the main components then of this GWP project. So after so after the background that Kevin's did, he came back to Canada and we decided to put together a bigger project because the equipment that he built could not see deep enough and also it was we're not able to use it to acquire 2d data. Wow.

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This week we will have opportunity to go back to the park, we'll use the same equipment that Kevin used to help you collect data, but we will at the same time introduce you to the new equipment. So you see the modern sis cow system and we'll take data with both of those systems. So.

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With the bigger project now with the CWB project, this is what we're proposing to do: we're going to teach the fundamentals of DC resistivity so that you understand how the technique works. It's important to have a mental idea, a clear understanding of the physics of what is happening in this experiment, so the.

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You'll have hands-on use of what is called jupiter notebooks. This is at the leading edge of scientific or tools for scientific research and communication and reproducibility. You will have access to them and be able to engage with these notebooks, to ask questions and to understand the physics so.

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The others things I've mentioned before so we're bringing will bring the new equipment will collect field data will interpret the data that is called inversion, so we're going to spend considerable time so that you understand what the inverse problem is and that you can get most information out of your data. So.

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I said we hope to carry out BC surveys and maybe 20 villages we're going to provide open source software for data processing and visualization.

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We want to work with the trainer of trainers and then we want to build drill wells based on those interpretations. We're.

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Our plan is got two phases in phase. One is a two weeks: training and courses. This is what we're going. This is what we're starting on right now, the course topics are going to be the fundamentals of DS for groundwater, the data acquisition processing and inversion and the use of the software. So.

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Do this to accomplish this, we're going to make heavy use of jupiter notebooks, so they're going to look something like this.

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So you're going to open up your computer and there's going to be a notebook in which you have the option to click different buttons and to use slider bars and to get images out and to ask questions about the process. The.

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Also part of the phase, one and important parts are the field surveys. So here's the new equipment, it's the sis, Cal system and it's got 72 electrodes on it that can acquire either the electric potentials or delivered delivered current. So that is going to be the system and we're going to tell you how the system works and how to collect the data and then also how to process and interpret the data. Well,.

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Part of our course is also going to be looking at case at case.

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Case histories.

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We're going to be looking at case histories. These are important for many reasons. Let me first of all tell you what a case history is. Maybe not try a sip numbers over here. So here's the.

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Here is a case: history images that that you're going to see the every time we do a geophysical experiment or we have a problem in which do physics use the way to understand how geophysics has been used is through this case history. So the first element is what's the problem, so in this case it's a hydrogeological 'm. You want to find out something about where the aquifer is. The second thing is which physical property do we use in our case for DC resistivity, it's the electrical resistivity.

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Then we go out and we collect data. It's a survey so we're going to use a DC resistivity survey, maybe with a Cisco system. Then we can plot those data up and just view them. We could process them or invert them to get now a picture of what's underneath the ground, and then we interpret that so now to do that, we have to interpret in terms of groundwater. Hydrology, say all maybe be aquifers at a certain depth, and then we have a synthesis to decide. Okay. How well did we do?

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That means maybe having drilled a borehole and saying oh yeah was there where they said, or it wasn't so everything that we do can be captured in a case history and we're going to be using those a lot, especially with your data in Mon state, to make case histories and you, as as students, will be developing these case histories as we go through so.

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That was really good. I didn't mean to talk so long, I forgot it me to transfer and okay. So we've got a few surveys. The case histories, okay and then important part is the trainer of trainers. I'll come back to that right in two slides, so.

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What are the learning goals that we want you to take to have? This is important if you're going to attend a course and if we're going to teach a course, then we should be explicit about what it is. We want to train you for so.

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Here's our goals dodging.

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The first is really establishing that relationship between groundwater and electrical resistivity, so.

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What is actually happening? How do I think about it? How do I understand it? Because if you understand it, then you can apply it properly. So.

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Choose different arrays different ways of acquiring the data for different geologies, so.

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They were going to train you on the Cisco instrument, how to acquire the data and how to process the data. Your.

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Going to train you on how to invert data for a 1d earth where the earth is just layered and how to train you for a 2d earth when things change horizontally and.

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Working with any data and inverting, it there's multiple outcomes or potential solutions that could happen. So the the solutions have a degree of non uniqueness that is associated with that, and you have to recognize this. For the you know, there are limits to the interpretation, so we want to talk about that and the realities of getting information from your geophysical data.

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O99 unique anointing meet problem is one in which there is two answers or more so, if I gave you the question, X plus y equals 1. What is the answer.

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And this is perhaps our biggest mission, and that is sustainability.

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Because it's one thing for us to come in and give a course and tell you lots of stuff and you get excited and we go home and you forget and nothing happens, da.

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We want to do is to train you. We want to find people in this audience who can be have experts, we can become specialists become the local resource for this soda.

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There's two types of people- and maybe one person can do both, but here is the ears the first that we want to identify and praying people to become local experts in the acquisition of data with the Cisco system. So you will become an essential part of any field crew that goes out into the villages. So.

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Teacher max knows more about field acquisition than anybody I know, and he will teach you how to use the instrument when things go wrong in feel what do I do? How do you like this so.

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The data, then you need to process it. You need to convert it to find out what that resistivity structure is so.

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That takes also training, so we want to have people who become expert in that bigger processing. Sorry.

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Is basically non unique, so you're always faced with fundamental problem of X plus y equals 1, and how do I put information in to get out an answer that is, hydrogen inversion?.

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So, what's our schedule that.

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One okay, we're going to do some background. Kevin is going to provide right after lunch, who do the background. We'll talk a bit about the basics of DC resistivity and the big mission for today. If we can do this, we are in a very good shape and that is to be able to get you to download your first notebook. So we have to do some work on your computers. We have to load software on. We have to make sure that we've got the internet connections.

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This is going to be a little bit consuming, but if we do it, we can't have a big check so.

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Now so tomorrow day, one matter a background by me got me something in cabling a separate, my maybe ro, the D CK chickeny para, maybe notebooks gonna be are a software layer, application and I'll computer here might download material blue Tomlin Internet of Ljubljana go t ha loop de haar alumni maternity, Neela, pdms, rangamma, wanna.

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Perfect, that's perfect because we'll need the laptops, we're going to download software and there's get your first app up and running. We can do that so.

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We are going to talk about soundings, DC, resistivity equipment and we're going to collect data in the park. Dude.

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Talk about parametric in inversion, I believe that the software that the National DRD is using is a parametric software inversion. We'll talk a little bit about that and that approach. But we will also talk about a general inverse theory to invert DC resistivity data, biometric.

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Parametric have parameters but you're looking for layers and resistivities.

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Later, but this is what you're, this is, what you're doing I believe at the National DRD the results that we have seen for your lawn skate, where we have a number of vertical electric zombies. Look like they're interpreted that way, young.

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Going to show you a different way of working with data that will allow you to tackle complicated problems so.

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Me this parametric, an inversion, won't allow you to invert and if you have two-dimensional earth structures, not.

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We will now it start to look at more complicated earths so, where you have lateral variation and that will introduce the need for profiling, something called electrical resistivity tomography, ERT as to DDC resistivity, modeling and inversion, and.

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So then, we're going to do will do feel collection at some site- okay and then invert in.

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That's that's week, one I, don't probably we're going slowly, so some of this might actually be in part of this week. But the last week we plan to review, do more training of the tio T's, go to another field, dataset and develop some case histories of who.

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Help so these these are little icons, that kind of help us think. Okay, what section are we are we dealing with so the next that's going to come up we're going to give some background on the DC resistivity just give some background on the experiments.

B

The data that road we impose a labeled anomia pioneer, hos, alpha logo lollipop so for tomorrow, not between Xavi llama, has our DC resistivity, not that Bureau. Let me have the background. We will ship da bomb Allah. They.

C

Will do soundings, which is what you typically do. You have vertical electric soundings where you assume the earth is one-dimensional and then you just try to find deeper yeah.

B

The bomb sounding sounding.

E

Is an emission demo yeah.

C

And then we'll do field surveys. So here's where we'll talk about equipment go collect data. What.

B

Suggested think of that, oh man once.

C

You collect the data in the park and we want to come back and invert it to find what the reasons Dimity structure is so we'll first use a code that is similar to what the National DRD is using. So.

B

The nebular Maloney on Zomato need a examples. A newborn ah dinner pose ideal. Queenston man was even yell at how parametric inversions are tinabobina Ptolemais. That's when the young Zomato happens, and you look your body then.

C

To get more complicated and realistic, we will bring into we're going to talk about inversion, so there's both the linear part and then a nonlinear part. The DC resistivity is sitting up here in the nonlinear part, so.

B

Linear linear, is that online about how you know no line it for a graphic. Ptolemy inversion pose I mean not, which are nonlinear Zoar, lima, hotel,.

F

B

C

Then we will do the owner to 2d electrical resistivity tomography, so we get out the cross-section images now.

B

So much' ERT is ready, electro resistivity, how I found that rotten, 2d, gonna 2d 2d craft were young ago so.

C

That's that's our plan. I guess we will now break for lunch and then reconvene at 1:15.

D

C

Then we'll start with the background and we're going to see if we can transfer or to load some notebooks onto your machines. So.

B

C

B

Is not me tonight, look the nice and Absalom Ivana happy! No one of your application of Donald's. You may converge on a hotel, oh yeah, yeah, so sign Luciana.

E

B

C

B

We are a commuter Tolono, Parliament, Rossum I, don't know she may mean.

F

We are the from Java.

F

C