Changes in material transport depending on the flood scale
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Changes in Material Transport Depending on the Flood Scale. Civil Engineering Research Institute of Hokkaido ○ Y . Yoshikawa Y . Watanabe. Studied River. Saru River. Aims of Study. [ 1] To clarify the relationship between SS and nutrients during four floods

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Changes in Material Transport Depending on the Flood Scale

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Changes in material transport depending on the flood scale

Changes in Material Transport Depending on the Flood Scale

Civil Engineering Research Institute of Hokkaido

○ Y . Yoshikawa

Y . Watanabe


Studied river

Studied River

Saru River


Aims of study

Aims of Study

[1] To clarify the relationship between SS and nutrients during

four floods

[2] To estimate the amount of nutrients deposited in the floodplain

as the result of flooding

Hugest flood

Flood 4

Flood 1

Flood 2

Flood 3


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport

Saru River basin

Nibutani

Dam

Pacific Ocean

Sarugawa Bridge

tributary

tributary

Observation locations on main stream

10km

Data for study are from three observation locations downstream of Nibutani Dam on the Saru River.


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport

Relationship A [Q – SS]

Flood 1

Flood 2

-Hugest flood- Flood 3

Flood 4


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport

Relationship B [Q – TN], [Q – TP]

Flood 1

Flood 2

-Hugest flood- Flood 3

Flood 4


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport

Relationship C [SS – nutrients]

Flood 1

Flood 2

-Hugest flood- Flood 3

Flood 4


Changes in material transport depending on the flood scale

[1] Clarifying the relationships between factors of material transport

Snowmelt flood in 2003 ….. Flood 2

・The ratio of SS to Q increased

・The ratio of TP to Q increased

1

Snowmelt flood in 2004 ….. Flood 4

Rainfall flood in 2001 ….. Flood 1

2

・Each relation was changeless.

Rainfall flood in 2003 ….. The Hugest flood

・Nutrients adhere to SS and

transported regardless of flood scale.

3


Changes in material transport depending on the flood scale

[2] Estimating the amount of nutrients deposited on the floodplain as a result of flooding

Correlation

α X SS β

nutrient

=

α,β : constant


Changes in material transport depending on the flood scale

[2] Estimating the amount of nutrients deposited on the floodplain as a result of flooding


Conclusion

Conclusion

[1] Relationships between factors of material transport

Between the two snowmelt floods (one before and one after the hugest flood), the ratio of SS to Q and the ratio of TP to Q increased.

[2] Estimation of nutrient deposition

on the floodplain by flooding

Calculation found that locations of nutrient deposition differ by flood scale.


End of presentation

End of presentation


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