Showing posts with label Desert. Show all posts
Showing posts with label Desert. Show all posts

Friday, 30 July 2010

What's in Your Fridge

You can learn a lot about someone by the contents of their fridge.


For example, if you looked inside my fridge right now you would find fruit, meat, Greek yogurt and...a high-power emergency light blinking.

From Arctic to Amazon

One of the problems when camping in the Salar de Uyuni is the possibility of vehicles driving across during the night (sometimes with their headlights off!).

So is there a danger I will be run over by a 4x4 while sleeping?

Salar de Uyuni, BoliviaImage via Wikipedia

I think it is extremely unlikely that a vehicle travelling on a 10000 square Km salt flat will actually pass through any particular point the size of a 1-person tent. But for my own piece of mind I decided to use signal lights around my tent at night.


FoxFire is a rugged, super bright light which is designed for use in emergency helicopter landing zones, disaster sites etc. I got one for £28/$43 the other day for testing as I need to determine the battery life in very low temperatures.


And what better way of doing that than sticking one in the freezer at -18C, loaded with 4 Energizer Lithium batteries (which are less affected by cold than alkaline batteries).


It has been blinking since Tuesday night now and still going strong.

Monday, 19 July 2010

Expedition Fitness: Is There Such a Thing? (1)

Atacama, the world's driest desertImage via Wikipedia


Do expeditions require a special kind of fitness? Or, to put it another way, is there a type of fitness you or I can have that would help us cope in an Expedition?
This question, as it stands, is too generic to be answered properly. Let’s break it down a little.



Fitness
The first thing that strikes me is that fitness can be physical or mental. To simplify things for this post let’s focus on the former.
So what is physical fitness? In his excellent book “Get Fit Not Fat” Greg Whyte lists four components of fitness:
That’s a nice and simple definition and can serve as a good basis for an exercise program. But is it complete?
In its October 2002 edition, The Crossfit Journal defines fitness as follows:
  1. Cardiovascular/respiratory endurance - The ability of body systems to gather, process, and deliver oxygen
  2. Stamina - The ability of body systems to process, deliver, store, and utilize energy.
  3. Strength - The ability of a muscular unit, or combination of muscular units, to apply force.
  4. Flexibility - the ability to maximize the range of motion at a given joint.
  5. Power - The ability of a muscular unit, or combination of muscular units, to apply maximum force in minimum time.
  6. Speed - The ability to minimize the time cycle of a repeated movement.
  7. Coordination - The ability to combine several distinct movement patterns into a singular distinct movement.
  8. Agility - The ability to minimize transition time from one movement pattern to another.
  9. Balance - The ability to control the placement of the bodies center of gravity in relation to its support base.
  10. Accuracy - The ability to control movement in a given direction or at a given intensity.
A more comprehensive definition. But it seems to me that a definition of Fitness should be relative  - not absolute. Relative to the requirements, stresses and pressures placed upon you by the environment.
I may be fit for one thing but not fit enough for another; I may be fit for playing football at home but not for hauling a sled to the South Pole. Or the other way around.
And what are the demands placed upon you by the environment on an expedition? Well, that depends on the type of the expedition.



Expeditions
Up until recently the term “expedition” was used almost synonymously to “Exploration”. These days the same word tends to mean different things to different people: from a gap year adventure, to a tough trek, to a high mountain climb.
My definition is as follows: An expedition is a physical and mental challenge in a remote area with a definite purpose.
So this narrows it down a bit and leaves us with physically challenging activities in remote areas: deserts, 

Leaving traces on soft sand dunes in Tadrart A...Image via Wikipedia

jungles, ice caps, mountains (deliberately ignoring underwater expeditions here).
Each one of these environments would pose different challenges to the adventurer: heat, cold, humidity, wind, altitude etc. In addition the purpose of the expedition may impose challenges of its own:

An expedition to ski across Greenland would pose different challenges than one to cross it with dog teams.

An expedition to cross a jungle would be very different than one to cross the same jungle but living off the land without external food or water.

An expedition to run across a desert with a support team and one to walk across it solo and unsupported are two very different propositions.
Dog-sleddingImage by David_Turner via Flickr

All these factors will affect training regime to be followed in preparation for the expedition. In a later post I will describe my approach to Expedition Training.






Saturday, 10 July 2010

Salar de Uyuni - Challenges (Part 2)

Water

Single file nowImage by Jessie Reeder via Flickr
There are no sources of water in the Salar de Uyuni so I will have to carry all my water with me. I am assuming I will need 8 liters per day. I will need to find containers that will not burst when the water freezes in them. The weight of the water (and the rest of the stuff) means that I will not be able to carry everything on my back, so I am going to need some other means of...

Transportation

I will need some sort of cart to put everything in. I will then be pulling the cart by way of a harness/attachment system. There are two options:
  • Get it from the UK and carry it to Bolivia
  • Get it built while in Bolivia before the expedition.
A cycle trolley will have to be modified to be used for walking.
Licancabur ReflectionImage by magnusvk via Flickr

The problem with buying one from here is that it might not be large enough or strong enough to take what I need to carry: the volume and weight of which is impossible to determine with accuracy before my departure.

Getting the trolley built there has obvious drawbacks: I may not be able to find the people  and equipment to help me build one.

Hard Ground

The salt on the Salar is so hard  it will be impossible to use normal tent pegs. Securing the tent will be very important due to the high winds that blow across the Salar.

One solution would be to stake the tent out with bottles of water. The issue with that is of course that bottles will gradually empty and after a few days they will not be heavy enough to hold the tent.
The Uyuni Salt flat is made of of various laye...Image via Wikipedia

The solution I am going for is to use very strong tent pegs and a hammer to drive them into the salt each night.

I plan to carry the pegs with me but I intend to buy the hammer in Bolivia.

What might happen of course is that once driven in the pegs will be very difficult to pull out. It is of course impossible to determine if thi is the case unless I go thre and try. The other thing that is impossible to determine beforehand is whether the salt will break and crumble when the peg is hammered in.

Different Kinds of Tent Pegs
 The photo on the right shows (from left to right):

  1. A normal low quality tent peg 
  2. A high-quality low-weight Hilleberg peg made from aluminium
  3. A snow tent peg 
  4. A hard ground tent peg  - basically a massive nail.

Hard Ground Pro Tent Pegs

Hard Ground Peg Close Up


I haven't tried these "Hard ground pro" tent pegs before so I will post a review when I come back from the Salar. They are certainly quite heavy so you wouldn't want to use them unless the ground was really hard and there were no other means of securing your tent.

Thursday, 8 July 2010

Salar de Uyuni - Challenges (Part 1)


There are several challenges I will be facing while making the crossing. Below I have listed the ones I expect to cause issues (I am sure there will be unexpected ones too).

Cold

The obvious problem is that my water will freeze, which means drinking and cooking will become very
Taken in Megeve, FranceImage via Wikipedia
difficult. In the arctic or high mountains this is not a problem as you can melt snow using your stove. In the Salar there is no snow cover and I will be carrying my water with me in bottles.

If the temperature does not drop too far below freezing during the day frozen water will not be a problem - there will be enough liquid water in the evening for cooking and I can take a bottle with me in the sleeping bag for the morning.

If the water is frozen solid thoughout the day the only way out I can think of is by having a bottle on my person, under the jacket so that it doesn't freeze. I will use that for cooking and take a frozen bottle of water in my sleeping bag for the morning. Doesn't sound very appealing. Does anyone else have relevant experience? Any suggestions?

Wind

The place is extremely exposed and at a very high altitude so I do expect almost constant, strong, freezing wind. although it is tempting to think a tail wind would be preferable a very strong tail wind can cause knee problems as you are constantly trying to resist being pushed forward by it.

With high winds and very low humidity windburn will definitely also be a problem.

Sun

It is hard to overestimate the amount of sunllight reflected by a bright wide surface at 4km altitude. In Greenland I had sunburn in the indide of my nostrils, the roof of my mouth and the underside of my eyes, the latter because my sunglasses did not have "guards". This time around I have armed myself with a pair of Julbo Explorer glacier glasses. I haven't tried those before so when I come back I will write a review.

For head protection I will go for a shemagh. I will post a description of how this can be used at a later date.

The pictures below and on the right show the glacier glasses and shemagh. The yellow bits on the glasses are the guards which apparently stop light/wind/etc. coming through.




Wednesday, 7 July 2010

Salar de Uyuni Expedition - Salar Info

My next expedition will be to cross Salar de Uyuni solo and unsupported.

Salar de Uyuni at 10.5 thousand square kilometers (4,000 sq mi) is the world's largest salt flat and is located in Bolivia. Salar de Uyuni (and the smaller Salar de Coipasa) are what is left from a series of prehistoric lakes, the last of which dried out about 13,000 years ago.

The desert is at an altitude of 3.7 km (12,000 ft) and is basically a pool of brine 2 to 20 meters (7 to 66 ft) deep covered by a hard salt crust with a thickness varying between tens of centimeters to a few meters.

In the wet season lake Titicaca overflows and discharges into Salar the Uyuni (via other intermediate lakes), which means there are a few cm of water on top of the salt crust.

I have picked August/September (the dry season) specifically to avoid this: Average precipitation is then just a fraction of that during the wet season (December to March). However, temperatures are also much lower with an average surface temperature in July/August of -10C (14 F). So I expect night-time temperatures to drop to  -20C (-4 F).


Photo from Wikipedia, author Anouchka Unel


 Photo from Wikimedia Commons, author Martin St-Amant


Photo from Wikimedia commons, author Lion Hirth



Map of Bolivia. Salar is the white bit at bottom left.


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