OVERVIEW OF THE DTS CAMPAIGN AT CABAUW TO MEASURE NEAR-SURFACE FOG

WHEN: 3 November to 22 November, 2017
WHERE: Cabauw Energy Balance Field (approx: 51°58'18.8"N 4°55'29.0"E; see map & schematic)
WHO: Jonathan Izett (GRS) and Bart Schilperoort (WR)

INSTRUMENTS:
   Ultima (DTS) with 6 mm reinforced fibre optic cable
   
SITE VISITS:
	3/11 - set up (10.00-19.00)
	6/11 - Maintenance and Image Download (12.00-17.00)
	10/11 - Maintenance and Camera Removal (11.00-13.00)
	14/11 - Maintenance and Camera Replacement (11.00-14.00)
	17/11 - Maintenance and Image Download (11.30-16.00)
	22/11 - removal (10.00-14.00)
 
INSTRUMENT NOTES:
	Timezone: UTC + 1
	Distances along cable:
		Dry Profile Base: 248.5 m
		Wet Profile Base: 232.2 m
		Dry Coil Top: 270.55 m
		Dry Coil Base: 261.9 m
		Wet Coil Top: 280.6 m
		Wet Coil Base: 277.7 m
		Top of Wooden Fence: 165.9 m (outgoing), 348.45 m (incoming) (141 m from tower)

FIELD/DATA QUALITY NOTES:		
	3/11	- Unsure if wrapped coils properly wet; left without confirming
	4&5/11	- dry coil blew over in wind; data unreliable until re-righted on 6/11 (visible in the data)
	6/11	- Wet profile and coil dry
			- Hose to wet coil had come loose: reattached and fixed with zip ties
			- Leak in hose to wet profile; removed problem
				- adjusted pumps throughout afternoon to get balance right (6.5 L/h for profile, 4.9 L/h for coil)
			- Reset dry coil which fell over on weekend and staked to ground
				- Filled water tank
				- Freezing overnight means usefulness of wet coil limited 
	10/11	- Filled Water Tank
	14/11	- Filled Water Tank
	17/11	- Wet coil dry on arrival (possibly due to freezing of water in hose night before?)
			- Flow rate turned up on both pumps to achieve saturation then reduced to
					previous values
	22/11	- unsure if wet cable saturated; turned machine off just after 10.00			


OTHER NOTES:
	- cotton/synthetic wrapping both work well, but transitioning from one to the other is
		difficult (cotton saturates more easily than synthetic)
	- pumps did not pump at actual rate, but much reduced; ratio between pumps was
		important to ensure water flow in both (otherwise, one took all the water)