Table 1.

List of abbreviations and symbols used in the manuscript.

Abbreviation	Definition
_b	Benthic rate
_w	Water column rate
_b+w	Combined benthic and water column rate
ADV	Acoustic Doppler velocimeter
AEC	Aquatic eddy co‐variance
BFI	Base flow index
BFR	Base flow ratio
C	O2 concentration
$\overline{C}$	Time‐averaged O2 concentration
$C^{\text{'}}$	O2 concentration fluctuations
C D	Bottom drag coefficient
CL	Clay river Sem site (AS2)
CW	Chalk river Wylye site (CW2)
CTD	Conductivity‐temperature‐depth
E c	Compensation irradiance
E k	Light saturation parameter
ER	Ecosystem respiration
F EC	AEC‐based turbulent oxygen flux
GN	Greensand river Nadder site (GN1)
GPP	Gross primary production
h	AEC measurement height
k	von Karman constant
NEM	Net ecosystem metabolism
NEP	Net ecosystem primary production
O2	Dissolved oxygen
P	Production
P–E	Photosynthesis–irradiance
PAR	Photosynthetically active radiation
P max	Maximum production rate
R	Respiration
U	Flow‐velocity magnitude
$u\text{'}$	Longitudinal flow fluctuations
w	Vertical velocity
$\overline{w}$	Time‐averaged vertical velocity
$w\text{'}$	Vertical velocity fluctuations
z 0	Sediment surface roughness parameter