Effect of climate change on nutrient discharge in a coastal area, western Japan

Yuta Shimizu; Shin Ichi Onodera; Mitsuyo Saito

Effect of climate change on nutrient discharge in a coastal area, western Japan

Yuta Shimizu, Shin Ichi Onodera, Mitsuyo Saito

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

This study investigates the effect of climate change on nitrogen and phosphorus discharges from a watershed in western Japan. Numerical simulations for a 30-year period (1978-2007) demonstrate a decrease in the annual precipitation as well as in the loads of nitrogen and phosphorus, over the study period. Nutrient fluxes were estimated using the Soil and Water Assessment Tool (SWAT) model. The estimated phosphorus flux is more highly correlated with precipitation than the nitrogen flux. The results suggest a high correlation between phosphorus and discharge, but during the high precipitation years, phosphorus loads have decreased. A sensitivity analysis of parameters for phosphorus discharge showed that the most sensitive parameter is the support practice factor. Consequently, phosphorus flux could decrease from the Asahi River watershed in the future, because precipitation and flood events have decreased and so has the driving force for soil erosion, which is the primary source of the nutrients.

Original language	English
Title of host publication	Water Quality
Subtitle of host publication	Current Trends and Expected Climate Change Impacts
Pages	172-177
Number of pages	6
Publication status	Published - Dec 1 2011
Externally published	Yes
Event	Symposium HS04 on Water Quality: Current Trends and Expected Climate Change Impacts, Held During the 25th General Assembly of the International Union of Geodesy and Geophysics, IUGG 2011 - Melbourne, VIC, Australia Duration: Jun 28 2011 → Jul 7 2011

Publication series

Name	IAHS-AISH Publication
Volume	348
ISSN (Print)	0144-7815

Other

Other	Symposium HS04 on Water Quality: Current Trends and Expected Climate Change Impacts, Held During the 25th General Assembly of the International Union of Geodesy and Geophysics, IUGG 2011
Country	Australia
City	Melbourne, VIC
Period	6/28/11 → 7/7/11

Keywords

Nutrient load
Precipitation
SWAT model
Western Japan

ASJC Scopus subject areas

Earth and Planetary Sciences(all)

UN SDGs

This output contributes to the following Sustainable Development Goal(s)

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Shimizu, Y, Onodera, SI & Saito, M 2011, Effect of climate change on nutrient discharge in a coastal area, western Japan. in Water Quality: Current Trends and Expected Climate Change Impacts. IAHS-AISH Publication, vol. 348, pp. 172-177, Symposium HS04 on Water Quality: Current Trends and Expected Climate Change Impacts, Held During the 25th General Assembly of the International Union of Geodesy and Geophysics, IUGG 2011, Melbourne, VIC, Australia, 6/28/11.

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title = "Effect of climate change on nutrient discharge in a coastal area, western Japan",

abstract = "This study investigates the effect of climate change on nitrogen and phosphorus discharges from a watershed in western Japan. Numerical simulations for a 30-year period (1978-2007) demonstrate a decrease in the annual precipitation as well as in the loads of nitrogen and phosphorus, over the study period. Nutrient fluxes were estimated using the Soil and Water Assessment Tool (SWAT) model. The estimated phosphorus flux is more highly correlated with precipitation than the nitrogen flux. The results suggest a high correlation between phosphorus and discharge, but during the high precipitation years, phosphorus loads have decreased. A sensitivity analysis of parameters for phosphorus discharge showed that the most sensitive parameter is the support practice factor. Consequently, phosphorus flux could decrease from the Asahi River watershed in the future, because precipitation and flood events have decreased and so has the driving force for soil erosion, which is the primary source of the nutrients.",

keywords = "Nutrient load, Precipitation, SWAT model, Western Japan",

author = "Yuta Shimizu and Onodera, {Shin Ichi} and Mitsuyo Saito",

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T1 - Effect of climate change on nutrient discharge in a coastal area, western Japan

AU - Shimizu, Yuta

AU - Onodera, Shin Ichi

AU - Saito, Mitsuyo

PY - 2011/12/1

Y1 - 2011/12/1

N2 - This study investigates the effect of climate change on nitrogen and phosphorus discharges from a watershed in western Japan. Numerical simulations for a 30-year period (1978-2007) demonstrate a decrease in the annual precipitation as well as in the loads of nitrogen and phosphorus, over the study period. Nutrient fluxes were estimated using the Soil and Water Assessment Tool (SWAT) model. The estimated phosphorus flux is more highly correlated with precipitation than the nitrogen flux. The results suggest a high correlation between phosphorus and discharge, but during the high precipitation years, phosphorus loads have decreased. A sensitivity analysis of parameters for phosphorus discharge showed that the most sensitive parameter is the support practice factor. Consequently, phosphorus flux could decrease from the Asahi River watershed in the future, because precipitation and flood events have decreased and so has the driving force for soil erosion, which is the primary source of the nutrients.

AB - This study investigates the effect of climate change on nitrogen and phosphorus discharges from a watershed in western Japan. Numerical simulations for a 30-year period (1978-2007) demonstrate a decrease in the annual precipitation as well as in the loads of nitrogen and phosphorus, over the study period. Nutrient fluxes were estimated using the Soil and Water Assessment Tool (SWAT) model. The estimated phosphorus flux is more highly correlated with precipitation than the nitrogen flux. The results suggest a high correlation between phosphorus and discharge, but during the high precipitation years, phosphorus loads have decreased. A sensitivity analysis of parameters for phosphorus discharge showed that the most sensitive parameter is the support practice factor. Consequently, phosphorus flux could decrease from the Asahi River watershed in the future, because precipitation and flood events have decreased and so has the driving force for soil erosion, which is the primary source of the nutrients.

KW - Nutrient load

KW - Precipitation

KW - SWAT model

KW - Western Japan

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ER -

Effect of climate change on nutrient discharge in a coastal area, western Japan

Abstract

Publication series

Other

Keywords

ASJC Scopus subject areas

UN SDGs

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