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Comparison of the water balance of two forest stands using the BROOK90 model

Tahir, Bawar LU (2012) In Student thesis series INES NGEM01 20111
Dept of Physical Geography and Ecosystem Science
Abstract
Recent studies show that future climate change will have a major influence on the water balance of forests in which the projected increase in air temperature and variation in the precipitation around the world are expected to be among the most important drivers affecting the forest’s hydrological cycle.

The objective of this study is to compare the water balance of two forests stands in two different areas. Hartheim forest in the southern Germany and Norunda forest in the central Sweden. The physically-based, parameter rich hydrological BROOK-90 model was used in our study to simulate the water balance through analyzing the outputs data and comparing them with some of the observed data that were calculated directly from the forests.
... (More)
Recent studies show that future climate change will have a major influence on the water balance of forests in which the projected increase in air temperature and variation in the precipitation around the world are expected to be among the most important drivers affecting the forest’s hydrological cycle.

The objective of this study is to compare the water balance of two forests stands in two different areas. Hartheim forest in the southern Germany and Norunda forest in the central Sweden. The physically-based, parameter rich hydrological BROOK-90 model was used in our study to simulate the water balance through analyzing the outputs data and comparing them with some of the observed data that were calculated directly from the forests.

The projected changes in some of the meteorological variables and stand management were determined in four scenarios. The first scenario is control which simulated the current conditions of the area by using calculated data. The second scenario simulated the increasing and decreasing the forest’s Maximum Leaf Area Index “MAXLAI” by 30% and comparing to control. The third scenario represented the increasing maximum daily air temperature by 1˚C and total daily precipitation by 20% in two separate sub-scenarios and comparing them with the first scenario. Increasing maximum daily air temperature by 1˚C together with increasing MAXLAI by 30% and separately with increasing maximum daily air temperature by 1˚C together with decreasing MAXLAI by 30% were covered in the fourth scenario.

The both forests under the scenario of removing Leaf Area Index LAI by 30% shows an increase in the amount of water in the soil by 8.8% and 13% for Hartheim and Norunda forest respectively as an average value for the whole studying period. The maximum value of the annual evapotranspiration for the both forests is simulated under the scenario of increasing maximum daily air temperature by 1˚C together with increasing MAXLAI by 30% with value of 571mm for the year 2007 and 501mm in 2005 for Hartheim site and Norunda site respectively.

The study concludes that thinning of the forest has a great role in maintaining and regulating the water balance of the forest and decreasing the water deficiency. Norunda forest will be more sensitive to the long-term future projected increase in the air temperature than Hartheim forest. (Less)
Abstract (Swedish)
Popular science
This study is about the water balance of two forest stands. The water balance here means the inflow of the water by rain and outflow by evaporation and groundwater flow. The main question of this research is how increased air temperature and change in the precipitation will affect the water balance of these forests. This has been done through a modeling program which will be described below.

The two forests were Hartheim forest in the southern west of Germany and Norunda forest in the central of Sweden. The water balance of the forests was simulated using the computer model BROOK-90.

The projected changes in air temperature, precipitation and stand management were determined in four different scenarios. The first... (More)
Popular science
This study is about the water balance of two forest stands. The water balance here means the inflow of the water by rain and outflow by evaporation and groundwater flow. The main question of this research is how increased air temperature and change in the precipitation will affect the water balance of these forests. This has been done through a modeling program which will be described below.

The two forests were Hartheim forest in the southern west of Germany and Norunda forest in the central of Sweden. The water balance of the forests was simulated using the computer model BROOK-90.

The projected changes in air temperature, precipitation and stand management were determined in four different scenarios. The first scenario was control, which simulated the current conditions of the area by actual measured meteorological data. In the second scenario changes in the stand management by increasing and decreasing the forest’s Maximum Leaf Area Index (MAXLAI) were simulated. The third scenario represented increasing maximum daily air temperature by 1˚C and total daily precipitation by 20%. Increasing maximum daily air temperature by 1˚C together with increasing and decreasing MAXLAI by 30% were covered in the fourth scenario.

The results showed an increase in the soil water by 8.8% and 13% for Hartheim and Norunda forest respectively as an average value for the whole studying period for the scenario of removing leaves by 30%. Also, the maximum value of the annual evapotranspiration for the both forests was simulated under the fourth scenario with value of 571mm for the year 2007 and 501mm in 2005 for Hartheim site and Norunda site respectively.

The study concluded that thinning of the forest and decreasing MAXLAI by 30% has a great role in regulating the water balance of the forest and also decreasing the deficiency of water that may occur in the future and also concluded that the long-term future projected increase in the air temperature will have more effects on Norunda forest than Hartheim forest. (Less)
Please use this url to cite or link to this publication:
author
Tahir, Bawar LU
supervisor
organization
alternative title
Using a modeling program to compare the water balance of two forests
course
NGEM01 20111
year
type
H2 - Master's Degree (Two Years)
subject
keywords
evapotranspiration, transpiration, geography, physical geography, BROOK-90 Model, hydrological cycle
publication/series
Student thesis series INES
report number
255
language
English
id
2861439
date added to LUP
2012-07-17 10:15:55
date last changed
2012-10-01 10:52:04
@misc{2861439,
  abstract     = {Recent studies show that future climate change will have a major influence on the water balance of forests in which the projected increase in air temperature and variation in the precipitation around the world are expected to be among the most important drivers affecting the forest’s hydrological cycle. 

The objective of this study is to compare the water balance of two forests stands in two different areas. Hartheim forest in the southern Germany and Norunda forest in the central Sweden. The physically-based, parameter rich hydrological BROOK-90 model was used in our study to simulate the water balance through analyzing the outputs data and comparing them with some of the observed data that were calculated directly from the forests. 

The projected changes in some of the meteorological variables and stand management were determined in four scenarios. The first scenario is control which simulated the current conditions of the area by using calculated data. The second scenario simulated the increasing and decreasing the forest’s Maximum Leaf Area Index “MAXLAI” by 30% and comparing to control. The third scenario represented the increasing maximum daily air temperature by 1˚C and total daily precipitation by 20% in two separate sub-scenarios and comparing them with the first scenario. Increasing maximum daily air temperature by 1˚C together with increasing MAXLAI by 30% and separately with increasing maximum daily air temperature by 1˚C together with decreasing MAXLAI by 30% were covered in the fourth scenario.

The both forests under the scenario of removing Leaf Area Index LAI by 30% shows an increase in the amount of water in the soil by 8.8% and 13% for Hartheim and Norunda forest respectively as an average value for the whole studying period. The maximum value of the annual evapotranspiration for the both forests is simulated under the scenario of increasing maximum daily air temperature by 1˚C together with increasing MAXLAI by 30% with value of 571mm for the year 2007 and 501mm in 2005 for Hartheim site and Norunda site respectively.

The study concludes that thinning of the forest has a great role in maintaining and regulating the water balance of the forest and decreasing the water deficiency. Norunda forest will be more sensitive to the long-term future projected increase in the air temperature than Hartheim forest.},
  author       = {Tahir, Bawar},
  keyword      = {evapotranspiration,transpiration,geography,physical geography,BROOK-90 Model,hydrological cycle},
  language     = {eng},
  note         = {Student Paper},
  series       = {Student thesis series INES},
  title        = {Comparison of the water balance of two forest stands using the BROOK90 model},
  year         = {2012},
}