Archive for August, 2010
update Saturday; September 4, 2010 The paper “Nürnberger Nachrichten” published an article today pointing out the geological risks of Stuttgart 21.
What has happened to the oil in the gulf?
- my brain wanted to read #AGU10 RT @AutoCAD: register for #AU2010 early? free AU Membership today. http://bit.ly/crNSF9 (via @engis) #
- Jahrestreffen #Kontakt e.V. am 26. November! Are you there? https://www.xing.com/events/12-jahrestreffen-kontakt-551441 #
- Three Gorges Dam not as great as anticipated: http://ke-we.net/2ej #
- Forward #osmosis instead of backward – consumes less #energy New Scientist http://bit.ly/d8vdzc (via @columbiawater) #
Jo! Listen to the “soundtrack of science”! Rain! Rain! (via WaterWired)
Say you have many sets of samples (measurements). What do you do if you wanted to estimate the distribution of the underlying population? Ok, if all your samples are well behaving, you throw them in one pot, and estimate the distribution based on all the samples. Ok.
Now, what if you wanted, for whatever reason, to estimate the underlying distribution based on the individual sets of your samples? What you could do is estimate a distribution based on each sample. Then you would have to somehow average the distributions. How would you do that? By multiplication? Turns out – no. In fact, the average of the density functions of each sample seems to be a pretty good estimator of the underlying density function.
The book-recommendations on this book are among the most popular posts on this blog:
- my list of rcommended hydrogeology books;
- individual book reviews of “bottled and sold”, “bottlemania” “numbers rule your world” or “just enough”;
These recommendations so far have all been for books written in english. They are not all purely technical books or particularly textbooks. However, they are all related to the theme of “water”, despite my hands-on quantitative-statistical take on that theme.
Two things happened in the recent past: I realized that I use wikipedia for surprisingly many tasks. I realized that I haven’t used a book in ages for example to look up a distribution function. The other thing that happened, just the other day, was that I took a fairly old programming book, because I wanted to re-read on a certain topic. And I knew it was covered in that (old) book well.
That’s when I thought, that I really like well written books, despite the wickedness of the internet (despite the fact that it recently was claimed to be dead – or not). Then I wondered, what are the best German written books related to the subject I am working in and which also is the topic of this blog? Of course, this is a tough question. And the two books I am going to name in a second are most likely not the only ones. However, they are the two that came to my mind immediately:
The statistics book appears a bit daunting at first with its 1145 pages. I don’t believe it is possible to read the entire book and neither it is recommended by the authors. However, it has happened to me many times that I was looking for a certain topic, like “How does the Wilcoxon Rank Test work?”, and sure enough I found theory for the test as well as an example in the book.
In contrast to statistics, hydrogeology is not as clearly defined. It’s much harder to distinguish a given topic to be or not to be “a hydrogeology topic”. Hence it would seem much harder to write a book on “hydrogeology”, because it would have to cover many topics. However, Hölting and Coldewey have done an excellent job to explain in short and precise language the basics of hydrogeology, from geology, well hydraulic to chemical aspects. It deserves special mentioning that there is a nice chapter on practical aspects, for example on how to get water out of the ground or groundwater protection.
- RT @drjerque: Wow. Frazil ice video…every geo / hydro must see: http://bit.ly/brS1ar (via @cbdawson) #
- #kesselfieber -neue Seite über things to do in #stuttgart http://kesselfieber.de/ @kesselfieber #
- @BoreholeGroup Ah, drilling! Nice pics! But I thought you were drilling from ships? in reply to BoreholeGroup #
- Twitter for #science awesome new ideas via post on complexity of sinuous #channel #deposits in 3D http://bit.ly/bjcfEn (via @highlyanne) #
- #IEEE special issue on #water and #energy http://ke-we.net/29o #
- Need a #laptop (MacBookPro)? I'm selling one on eBay.de: http://ke-we.net/28r#ht_2501wt_1139 #
Nobody writes about why so many people died, or what the causes were: are there reservoirs? What was the estimated return period?
update Wednesday; August 4, 2010: There are reports that in Pakistan’s northwest, precipitation intensities were as high as 312mm within 36 hours.
update Saturday; August 14, 2010 NPR titles: “China, Pakistan Floods: Preventable Disasters?”
update Sunday; August 15, 2010 The Google Earth Blog has satellite images to be looked at in Google Earth showing the extent of the flood in Pakistan
update Tuesday; August 17, 2010:
- Steven Solomon’s view as written in the NY Times. He points out that the crazy thing is that Pakistan actually has a fresh water shortage.
- here’s a pretty impressive image from NASA (link to article; via Anne Jefferson @highlyanne )
update Friday; August 20, 2010:
Over at howbigreally.com, there is an awesome tool where you can center the overlay of the current extent of the floods in Pakistan over any other area in the world.
The CBC has a new article, stating that 4 million people are left homeless
updata Friday; November 19, 2010 … and Clinton says it’s climate change! Other people disagree Also the longer-term consequences are starting to emerge. I think especially worrisome is the question of what might happen to the food-situation next year?