introduction tohydrology b
DESCRIPTION
This is the second part of the introduction to the hydrological cycle.TRANSCRIPT
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Space Time
Riccardo RigonRiccardo Rigon
A. T
ack -
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and
Tim
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Monday, March 11, 13
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R. Rigon
River Networks
Monday, March 11, 13
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R. Rigon
River Networks
Monday, March 11, 13
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R. Rigon
River Networks
Monday, March 11, 13
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R. Rigon
River Networks
Monday, March 11, 13
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R. Rigon
River Networks
Monday, March 11, 13
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R. Rigon
Scales and patterns
Monday, March 11, 13
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R. Rigon
Scales and patterns
Monday, March 11, 13
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R. Rigon
Scales and patterns
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1
R. Rigon
Scales and patterns
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F. S
eraf
in, 2
01
1
R. Rigon
Scales and patterns
Monday, March 11, 13
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F. S
eraf
in, 2
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1
R. Rigon
Scales and patterns
Monday, March 11, 13
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F. S
eraf
in, 2
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1
R. Rigon
Scales and patterns
Monday, March 11, 13
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R. Rigon
Function and Form
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R. Rigon
Function and Form
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Sub
-cat
chm
ents
R. Rigon
Hillslopes
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Pix
el S
cale
R. Rigon
Smaller scales
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An
d e
ven
sm
alle
r
R. Rigon
Smaller scales
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Mass and energy
Riccardo Rigon
Bru
no M
un
ari
- A
ra P
acis
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Budgets
First you chose a control
volume
The budget represent
the variation of the given
quantity in the control
volume , for a given
time interval.
This is the algebraic sum
of what enters minus what
left the volume.
Depending on the budget type,
you have also to account for
chemical transformations,
including phase changes.
The water and energy budget
R. Rigon
Monday, March 11, 13
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The water budget
Surface
Vadose zone
Water tables
R. Rigon
The water and energy budget
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In the previous slides surface runoff, flow in
soils, and groundawater fluxes were still
missing.
The water budget
R. Rigon
The water and energy budget
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Eapotranspiration is also missing. This is the
sum of evaporation from surface waters,
evaporation from soils, and transpiration from
plants (grass, bushes, trees).
The water budget
R. Rigon
The water and energy budget
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The water budget in a soil volume
Groundwater runoff
R. Rigon
The water and energy budget
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The water budget in a soil volume
V a r i a t i o n o f t h e v o l u m e o f w a t e r within the volume of soil
Groundwater runoff
R. Rigon
The water and energy budget
Monday, March 11, 13
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The water budget in a soil volume
V a r i a t i o n o f t h e v o l u m e o f w a t e r within the volume of soil I n t en s i t y o f
precipitation
Groundwater runoff
R. Rigon
The water and energy budget
Monday, March 11, 13
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The water budget in a soil volume
V a r i a t i o n o f t h e v o l u m e o f w a t e r within the volume of soil I n t en s i t y o f
precipitation
Evapotranspiration
Groundwater runoff
R. Rigon
The water and energy budget
Monday, March 11, 13
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The water budget in a soil volume
V a r i a t i o n o f t h e v o l u m e o f w a t e r within the volume of soil I n t en s i t y o f
precipitation
Evapotranspiration
Surface runoff
Groundwater runoff
R. Rigon
The water and energy budget
Monday, March 11, 13
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The water budget in a soil volume
V a r i a t i o n o f t h e v o l u m e o f w a t e r within the volume of soil I n t en s i t y o f
precipitation
Evapotranspiration
Surface runoff
Groundwater runoff
Runoff in the soil
R. Rigon
The water and energy budget
Monday, March 11, 13
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The water budget in a soil volume
V a r i a t i o n o f t h e v o l u m e o f w a t e r within the volume of soil I n t en s i t y o f
precipitation
Evapotranspiration
Surface runoff
Groundwater runoff
Runoff in the soil
Time step
R. Rigon
The water and energy budget
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The control volume does not need to
be a simple form: a basins, for
instance, is a typical control volume.
The water budget
R. Rigon
The water and energy budget
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Examples
Control volume
The water budget
R. Rigon
The water and energy budget
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Examples
The water budget
R. Rigon
The water and energy budget
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Qg
Examples
The water budget
R. Rigon
The water and energy budget
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Qg
Examples
The water budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Qg
Examples
The water budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Examples
The water budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Il bilancio di massaAltri esempi
R. Rigon
The water and energy budget
Monday, March 11, 13
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Il bilancio di massaAltri esempi
R. Rigon
The water and energy budget
Monday, March 11, 13
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Il bilancio di massaAltri esempi
R. Rigon
The water and energy budget
Monday, March 11, 13
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Il bilancio di massaAltri esempi
R. Rigon
The water and energy budget
Monday, March 11, 13
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Examples
The water budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Examples
The water budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Examples
The water budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Lateraladvection ofvapour andwater
S u r f a c e runoff
subsurface runoff
The mass balance for a volume of atmosphere above the soil
R. Rigon
The water and energy budget
Monday, March 11, 13
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Variation of water and vapour in the layer of atmosphere considered
Lateraladvection ofvapour andwater
S u r f a c e runoff
subsurface runoff
The mass balance for a volume of atmosphere above the soil
R. Rigon
The water and energy budget
Monday, March 11, 13
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Variation of water and vapour in the layer of atmosphere considered
Intensity of net evaporation
Lateraladvection ofvapour andwater
S u r f a c e runoff
subsurface runoff
The mass balance for a volume of atmosphere above the soil
R. Rigon
The water and energy budget
Monday, March 11, 13
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The Energy budget
The first group of term in the
energy budget is the radiation
budget.
It includes short wave radiation
from the Sun; and long wave
radiation: from atmosphere and
clouds to the atmosphere.
Il bilancio di massa ed energia
R. Rigon
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Precipitation too enters in the
budget, which, for instance, can
contribute to snowmelt.
Heat flux towards the Earth center
depends on the depth of the control
volume, and can be either positive
or negative.
The Energy budget
R. Rigon
The water and energy budget
Monday, March 11, 13
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Il bilancio di energia
Finally we have also
evapotraspiration, and
heat exchanges by
convention from surface
and atmosphere.
R. Rigon
The water and energy budget
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Il bilancio di energia
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
R. Rigon
The water and energy budget
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Timeinterval
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Variation of energy stored in the soil
Timeinterval
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Variation of energy stored in the soil
Net short-wave radiation
Timeinterval
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Variation of energy stored in the soil
Net short-wave radiation
Net long-wave radiation
Timeinterval
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Variation of energy stored in the soil
Net short-wave radiation
Net long-wave radiation
Release of heat by convection / conduction to the atmosphere
Timeinterval
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Variation of energy stored in the soil
Net short-wave radiation
Net long-wave radiation
Release of heat by convection / conduction to the atmosphere
Heat content of evapotranspiration
Timeinterval
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
Variation of energy stored in the soil
Net short-wave radiation
Net long-wave radiation
Release of heat by convection / conduction to the atmosphere
Heat content of evapotranspiration
Timeinterval
Release of heat by convection / conduction to ground below
R. Rigon
The water and energy budget
Monday, March 11, 13
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The energy balance
�E = (Rsw n �Rlw n �H � �e ET n �G)�t
E n t h a l p y o f vaporisation (or l a t e n t h e a t o f vaporisation)
Evapotranspiration
R. Rigon
The water and energy budget
Monday, March 11, 13