A lake dammed by a stream EarthCache
A lake dammed by a stream
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This is about a 10km return hike along a fantastic and well maintained trail. The posted coordinates will take you to a bridge just before reaching the beautiful Kinney Lake where you will find an information sign.
Alluvial fan:
An alluvial fan is a fan- or cone-shaped deposit of sediment crossed and built up by streams. The fan is an unconsolidated sedimentary deposit that accumulates at the mouth of a mountain canyon because of a dimunition or cessation of sediment transport by the issuing stream. If a fan is built up by debris flows it is properly called a debris cone or colluvial fan. These flows come from a single point source at the apex of the fan, and over time move to occupy many positions on the fan surface. Fans are typically found where a canyon draining from mountainous terrain emerges out onto a flatter plain, and especially along fault-bounded mountain fronts. As a stream's gradient decreases, it drops coarse-grained material. This reduces the capacity of the channel and forces it to change direction and gradually build up a slightly mounded or shallow conical fan shape.
We get to enjoy the beautiful Kinney Lake because of an alluvial fan. The alluvial fan is a mass of sand and gravel built up on the valley floor where a stream drops the debris, which acts like a dam. The annual rush of meltwater in the Spring moves a great deal of eroded material, known as alluvium, down the steep creeks and into the single stream that reaches the valley here. The result is the alluvial fan that created Kinney Lake.
To log this earthcache please answer the following questions.
Please email me the answers, please do not put the answers in your online log.
1. Standing on the bridge and looking downstream, estimate the distance, from bridge to stream, and which bank of the river does the stream flow into that creates this alluvial fan?
2. The Robson River is unable to do what? Which causes the lake to be backed up behind the fan.
3. Estimate the width of the river at this location.
4. [Optional] Post of a picture of yourself or your GPS at the posted coordinates.
References:
https://en.wikipedia.org/wiki/Alluvial_fan
http://www.britannica.com/science/alluvial-fan
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