Monday, July 28, 2014

Some Interesting Podcast's I've Listened To Recently

I should be sharing this list more often-

1) On America's other migrant farm workers - Bees! Biologist Laurence Packer talks about the importance of bees in American agriculture. Incredible- millions of them are transported by trucks to aid in pollinating almonds and other fruit crops from one end of the U.S to the other!

2) Science Friday- Summer Book List 2014- What is not to like about a conversation that discusses a book like Proof- The Science of Booze!... and many more books featured in this talk.

3) Science Friday- Crafting Perfect Beer- more on the microbiology of beer and the burgeoning craft beer industry in the U.S.

4) Planet Money- The History of Light: Before there was the light bulb there was fat! Planet Money is one of my favorite podcast; it is economics explained with a light touch. This episode features how we got from candles made from cow fat and whale blubber to light at the flick of the switch and its economic implications in terms of the massive increase in human work productivity.

5) On Point Radio- The End of Night: A nostalgic look at what we have lost with our city life- the end of the night sky. Wonderful remembrances by callers too.

6) Fresh Air: To End All Wars: Its the 100th anniversary of the beginning of the Great War (World War I) and author Adam Hochschild discusses his book To End All Wars- you read this with a shudder- " I think the war remade the world for the worse in every conceivable way: It ignited the Russian Revolution, it laid the ground for Nazism and it made World War II almost certain. It's pretty hard to imagine the second world war without the first."

Wednesday, July 23, 2014

Bahama Carbonate Precipitation Triggered By Saharan Dust

Interesting paper in Geology : The fertilization of the Bahamas by Saharan dust: A trigger for carbonate precipitation? - P.K. Swart, A.M. Oehlert, G.J. Mackenzie, G.P. Eberli and J.J.G. Reijmer


The enigma of the Bahamas is that this highly productive carbonate system has existed for at least 100 m.y., building a vast edifice of carbonates, thousands of meters thick, in an essentially nutrient-poor environment. Based on measurements of the insoluble material, the Fe and Mn in the carbonate fraction, and the δ15N of the sedimentary organic matter, we suggest a paradigm shift in order to explain the formation of the Bahamas and possibly other similar platforms. We propose that the Great Bahama Bank is currently, and may in the past have been, fertilized by atmospheric dust, promoting the fixation of atmospheric N2 by cyanobacteria. These cyanobacteria provided a source of nitrogen to the rest of the community in this nutrient-poor environment. The fixation of N has imparted a characteristic δ15N signal and has been responsible, through the drawdown of CO2, for initiating the precipitation of carbonate in the shallow waters. This phenomenon might be responsible for the formation of vast amounts of sediments in the oceans, not only within recent times, but throughout geological history, particularly in the early history of the Earth prior to the existence of calcium carbonate–secreting organisms.

Many carbonate sedimentologists suspect that microbial activity has played an important role in carbonate sediment precipitation and this paper provides more evidence for it from a familiar setting. The geology of the Bahamas has been extensively studied but sometimes basic questions remain "Why such  prolific sediment production by organisms in a nutrient poor environment?".  The answer in this case may be an exogenous source of nitrogen. Whether this is a more general explanation remains to be answered. There may be other controls, for example in the Proterozoic sea water chemistry was different with elevated levels of calcium carbonate saturation. This means that there were lots of Ca and CO3 molecules available to aggregate as CaCO3 crystals. This enabled -with and without the aid of microbial activity-  vast deposits of carbonates to accumulate.

Tuesday, July 1, 2014

Geology Ignored In The Planning And Building Of Himalayan Dams

In Current Science K.S Valdiya explains (Open Access):

It will be obvious from the distribution of dam locations (Figure 1; Tables 3–6) based on information culled from reports of Central Electricity Authority, Uttara-khand Hydroelectricity Nigam, Uttarakhand Renewable Energy Development Authority, etc. that the existing hydroelectric projects and those that are under construction or planned are sited close to the terrane-defining thrusts known to be active. The sites were chosen presumably in the narrowest stretches of the river valleys, little realizing that the otherwise wide valleys with gentle valley sides become narrow with steep to nearly vertical walls due to uplift of the ground and attendant accelerated riverbed erosion as explained earlier. The ground rises as a conse-quence of upward movement on active faults/thrusts (Figure6). Moreover, the belts of active faults are made up of deformed rocks –many-times folded, sheared, shattered an even crushed rocks. These rocks understandably easily break-up, fall -off, creep and slide or slump down when excavated or shaken by earthquakes and explosions,and sink under loads. These incidences are bound to pose a threat to the various structures built in the project areas.

The development of hydroelectric projects not only entails excavations for the head race dams and associated coffer dams, diversion tunnels, main tunnels for carrying water to turbines, and multitudes of adits, but also for thenetwork of roads, for residential colonies for work force,and for power generators. Obviously, a dam site–nomatter if it is just a small one–is excessively subject to tampering with the natural balance in a zone of very weakened rocks.

Reactivation of the active thrusts is bound to impact the stability of the engineering structures. One of the impacts could be the displacement or disruption of the structures due to sudden release of stress that the thrust movements entail. The effects on the tunnels associated with dams would be far more severe – there would be dis-ruption or offsetting of tunnel, roof collapse, sudden on-rush of interstitial groundwater with crushed material,and severe damage to tunnel lining. The very making of a tunnel is like opening an underground drainage and thus altering the groundwater regimes of the mountains, resulting in drastic lowering of groundwater table and at tendant drying up of springs and dwindling of surface flow in streams.

Figure 1 is self-explanatory. Needless to state that a large number of existing and planned hydroelectric projects are bound to encounter serious problems, particularly if and when movements take place on the thrusts in the proximity of the project locations.

Uttarakhand has plans for 180 big and small hydroelectric projects with 95 dams in the middle and upper reaches of the Alaknanda and Bhagirathi rivers in the vicinity south of the Main Central Thrust. K.S Valdiya suggests that the sites should be chosen preferably north of the Main Central Thrust in regions with much lower population density which will lead to less environmental, social and economic problems. The current government has indicated that it will lean towards rapid environmental clearances for infrastructure projects, so just how much attention will be given to warnings like this one?