1:45 PM - 3:15 PM
[O11-P120] Possibility of Disaster Prevention by Plants Ⅱ
Keywords:Disaster prevention, Landslide
1. motivation and purpose of the study
In recent years, natural disasters have been increasing in Japan, and countermeasures against disasters have become necessary.Therefore, we wanted to conduct some research related to disaster prevention and decreasing the risk, and focused on landslide disasters.Previous studies by our predecessors had revealed differences in disaster prevention effectiveness depending on the existing or absence of plants.We decided to study whether differences in the shape of plant roots make a difference in the effectiveness of disaster prevention.The roots targeted in this experiment were conifers, which account for 58% of the privately owned forest resources in Nagano Prefecture.In this experiment, we started with columnar root system species such as Japanese red pine (Pinus densiflora), followed by vertical and oblique root systems found in Japanese cedar, beech and konara (Quercus serrata), and oblique root systems found in Japanese cypress, larch, and many other broad-leaved trees.
2. Previous Studies
<Previous studies referred to in this study (1)
Hyogo Prefectural Kobe High School, "Landslide Disaster Modeling: Do Forests Prevent Landslides?
In this study, we created a device to reproduce a collapse and conducted an experiment.This experiment was very similar to what we wanted to investigate, and the reproduction device was also useful in our research.
This experiment was very similar to what we wanted to investigate, and the reproducers were also useful in our research.Therefore, we conducted our research based on this study.This study did not include an experiment to compare the effect of changing the shape of the roots on the prevention of disasters.
<Previous studies that were used as references (2)
Research on "Possibility of Disaster Prevention by Plants: Effects of Tree Roots on Disaster Prevention were Observed" in 2023 at our school.
In this study, we referred to the research conducted by Kobe High School and conducted experiments using a reproduction device and a root model.We decided to continue using the reproducers and root models used in this study.
We decided to continue to use the same reproducers and root models used in this study.This study did not test the difference in disaster-prevention effects of different types of roots. 3.
3.Research Methodology
<March-October>
Experiments focused on reproducing actual collapse using a jar.
The experiment focused on reproducing actual collapses using a jar.The experiment focused on reproducing actual disintegration using a jar,
The experiment focused on reproducing the actual collapse using a joule.
<② October - December>
An experiment focused on the difficulty of pulling out each root in the vertical direction.The roots were buried in a bucket of soil.Pulled only the spring attached to the root in the vertical direction. 4.
4. experimental results
<1> March to October <2>December to December
In this experiment, in order to reproduce actual collapse on a smaller scale, we consider that the longer the average time until collapse, the more resistant the soil is to collapse.As a result, we can say that roots are more effective against collapse because the average time to collapse is longer when roots are present.The resistance to collapse by root type was also as follows.
Vertical oblique rootstock > Oblique rootstock > Columnar rootstock
<② October to December>
The maximum force required to pull the roots out of the soil was as follows
The maximum force to pull the roots out of the soil was as follows.
Columnar rhizome tree > Vertical oblique rhizome tree > Oblique rhizome tree 5.
5. discussion
The lack of correlation between the force required to pull the roots out and the resistance of the roots to collapse was considered to be related to the compatibility between the roots and the soil.Possible explanations for this factor include differences in the resistance of roots to forces from different directions depending on the root type and the shape of the above-ground tree, as well as differences in the affinity of roots for massa soil.
6. Acknowledgments
We would like to thank Fab Lab, Faculty of Education, Shinshu University, for their cooperation in our research.We will continue to work hard and make use of what we have learned through this research.Thank you very much.
In recent years, natural disasters have been increasing in Japan, and countermeasures against disasters have become necessary.Therefore, we wanted to conduct some research related to disaster prevention and decreasing the risk, and focused on landslide disasters.Previous studies by our predecessors had revealed differences in disaster prevention effectiveness depending on the existing or absence of plants.We decided to study whether differences in the shape of plant roots make a difference in the effectiveness of disaster prevention.The roots targeted in this experiment were conifers, which account for 58% of the privately owned forest resources in Nagano Prefecture.In this experiment, we started with columnar root system species such as Japanese red pine (Pinus densiflora), followed by vertical and oblique root systems found in Japanese cedar, beech and konara (Quercus serrata), and oblique root systems found in Japanese cypress, larch, and many other broad-leaved trees.
2. Previous Studies
<Previous studies referred to in this study (1)
Hyogo Prefectural Kobe High School, "Landslide Disaster Modeling: Do Forests Prevent Landslides?
In this study, we created a device to reproduce a collapse and conducted an experiment.This experiment was very similar to what we wanted to investigate, and the reproduction device was also useful in our research.
This experiment was very similar to what we wanted to investigate, and the reproducers were also useful in our research.Therefore, we conducted our research based on this study.This study did not include an experiment to compare the effect of changing the shape of the roots on the prevention of disasters.
<Previous studies that were used as references (2)
Research on "Possibility of Disaster Prevention by Plants: Effects of Tree Roots on Disaster Prevention were Observed" in 2023 at our school.
In this study, we referred to the research conducted by Kobe High School and conducted experiments using a reproduction device and a root model.We decided to continue using the reproducers and root models used in this study.
We decided to continue to use the same reproducers and root models used in this study.This study did not test the difference in disaster-prevention effects of different types of roots. 3.
3.Research Methodology
<March-October>
Experiments focused on reproducing actual collapse using a jar.
The experiment focused on reproducing actual collapses using a jar.The experiment focused on reproducing actual disintegration using a jar,
The experiment focused on reproducing the actual collapse using a joule.
<② October - December>
An experiment focused on the difficulty of pulling out each root in the vertical direction.The roots were buried in a bucket of soil.Pulled only the spring attached to the root in the vertical direction. 4.
4. experimental results
<1> March to October <2>December to December
In this experiment, in order to reproduce actual collapse on a smaller scale, we consider that the longer the average time until collapse, the more resistant the soil is to collapse.As a result, we can say that roots are more effective against collapse because the average time to collapse is longer when roots are present.The resistance to collapse by root type was also as follows.
Vertical oblique rootstock > Oblique rootstock > Columnar rootstock
<② October to December>
The maximum force required to pull the roots out of the soil was as follows
The maximum force to pull the roots out of the soil was as follows.
Columnar rhizome tree > Vertical oblique rhizome tree > Oblique rhizome tree 5.
5. discussion
The lack of correlation between the force required to pull the roots out and the resistance of the roots to collapse was considered to be related to the compatibility between the roots and the soil.Possible explanations for this factor include differences in the resistance of roots to forces from different directions depending on the root type and the shape of the above-ground tree, as well as differences in the affinity of roots for massa soil.
6. Acknowledgments
We would like to thank Fab Lab, Faculty of Education, Shinshu University, for their cooperation in our research.We will continue to work hard and make use of what we have learned through this research.Thank you very much.