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Hydrologic response of climate change in the source region of the Yangtze River, based on water balance analysis

Du, Yiheng LU ; Berndtsson, Ronny LU ; An, Dong LU ; Zhang, Linus LU ; Hao, Zhenchun and Yuan, Feifei LU (2017) In Water (Switzerland) 9(2).
Abstract

Due to the large amount of water resources stored in glaciers, permafrost, and lakes, the source region of the Yangtze River (SRYR) is of great importance for the overall basin water flow. For this purpose, a state of art review and calculations were made for the period 1957-2013 using observed hydrological and meteorological data with a water balance approach. Actual evapotranspiration was calculated and validated by empirical formulas. Water storage change analysis was conducted with uncertainty boundaries using a 10-year moving window. Results show that temperature, precipitation, and actual evapotranspiration in the SRYR increased by 0.34°C, 11.4 mm, and 7.6 mm per decade, respectively (significant at 0.05 probability level).... (More)

Due to the large amount of water resources stored in glaciers, permafrost, and lakes, the source region of the Yangtze River (SRYR) is of great importance for the overall basin water flow. For this purpose, a state of art review and calculations were made for the period 1957-2013 using observed hydrological and meteorological data with a water balance approach. Actual evapotranspiration was calculated and validated by empirical formulas. Water storage change analysis was conducted with uncertainty boundaries using a 10-year moving window. Results show that temperature, precipitation, and actual evapotranspiration in the SRYR increased by 0.34°C, 11.4 mm, and 7.6 mm per decade, respectively (significant at 0.05 probability level). Runoffappears to have increased at a rate of 3.3 mm per decade. The SRYR water storage in total has not changed significantly during the period, although the moving average is mostly below zero. Based on the water balance equation, the increase in calculated evapotranspiration is mainly due to the significantly increasing temperature. This in combination with increasing precipitation leads to a relatively stable water storage during the study period. Correlation analyses show that precipitation dominates runoffduring the warm season (May to October), while temperature anomalies dominate the runoffduring the cold season (November to April). The influence of temperature on runoffseems to enhance during the winter period.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Climate change, Correlation analysis, Source region of the Yangtze River, Uncertainty propagation, Water balance
in
Water (Switzerland)
volume
9
issue
2
publisher
MDPI AG
external identifiers
  • scopus:85013839750
  • wos:000395435800045
ISSN
2073-4441
DOI
10.3390/w9020115
language
English
LU publication?
yes
id
58f792ad-cb6c-495b-9363-6c60721906ba
date added to LUP
2017-03-08 15:23:02
date last changed
2018-01-07 11:54:45
@article{58f792ad-cb6c-495b-9363-6c60721906ba,
  abstract     = {<p>Due to the large amount of water resources stored in glaciers, permafrost, and lakes, the source region of the Yangtze River (SRYR) is of great importance for the overall basin water flow. For this purpose, a state of art review and calculations were made for the period 1957-2013 using observed hydrological and meteorological data with a water balance approach. Actual evapotranspiration was calculated and validated by empirical formulas. Water storage change analysis was conducted with uncertainty boundaries using a 10-year moving window. Results show that temperature, precipitation, and actual evapotranspiration in the SRYR increased by 0.34°C, 11.4 mm, and 7.6 mm per decade, respectively (significant at 0.05 probability level). Runoffappears to have increased at a rate of 3.3 mm per decade. The SRYR water storage in total has not changed significantly during the period, although the moving average is mostly below zero. Based on the water balance equation, the increase in calculated evapotranspiration is mainly due to the significantly increasing temperature. This in combination with increasing precipitation leads to a relatively stable water storage during the study period. Correlation analyses show that precipitation dominates runoffduring the warm season (May to October), while temperature anomalies dominate the runoffduring the cold season (November to April). The influence of temperature on runoffseems to enhance during the winter period.</p>},
  articleno    = {115},
  author       = {Du, Yiheng and Berndtsson, Ronny and An, Dong and Zhang, Linus and Hao, Zhenchun and Yuan, Feifei},
  issn         = {2073-4441},
  keyword      = {Climate change,Correlation analysis,Source region of the Yangtze River,Uncertainty propagation,Water balance},
  language     = {eng},
  number       = {2},
  publisher    = {MDPI AG},
  series       = {Water (Switzerland)},
  title        = {Hydrologic response of climate change in the source region of the Yangtze River, based on water balance analysis},
  url          = {http://dx.doi.org/10.3390/w9020115},
  volume       = {9},
  year         = {2017},
}