Lake
Bonney (East Lobe) Circumnavigation to Map Wetted Zone
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| The
goal of this activity is to map out the wetted zone that surrounds the
east lobe of Lake Bonney and determine the physical characteristics
that govern the width of these wetted zones. Methods: We used a Trimble kinematic GPS rover with base station to acquire ~2 cm resolution in our survey. The lake wetted edge and edge of the wetted zone, as determined by eye, were surveyed with a position being acquired every 5 sec. Every 100 m, the team would stop and make measurements of 1) position, 2) surface soil moisture, and 3) active layer depth (determined by pushing a T-bar to the point of refusal) at 4 points along the wetted zone gradient. 2 points trisected the wetted zone, a third was right on the outer edge of the wetted zone, and a 4th point was about 1 m into the dry soils. GPS points were acquired for each of these measurement locations. Every 700 m, this same data collection occurred plus sampling of surface (10 cm) sediment for particle size fraction to be determined in the lab. The survey began on 04 Jan 2006 and was completed on 07 Jan 2006. |
 Brad Bate using the UNAVCO GPS equipment to survey the lake edge. |
 Melissa Northcott uses the T-bar to determine depth to resistance. |
 Lydia takes moisture readings from the surface soils. |
 Every 100 m, we measured depth of active layer, soil moisture, and soil electrical conductivity. |
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