Attribution of Streamflow Variations in Southern Taiwan

Tsao, Jyun; Lee, Cheng Haw; Yeh, H. C.

doi:10.3390/w12092465

Cited by 3 publications

(1 citation statement)

References 56 publications

(67 reference statements)

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“…In the subsequent research, many scholars have rewritten the Budyko formula from Equation (2) into different forms, divided into non-parametric and parametric forms. Since the parametric form of the Budyko formula leads to results that are closer to the observation data in southern Taiwan as compared to the non-parametric form [31], it is adopted in this study to carry out the subsequent analyses. Different forms of the Budyko formula are suitable for different environmental conditions, as shown in Table 1.…”

Section: Budyko Frameworkmentioning

confidence: 99%

Quantifying the Relative Contribution of the Climate Change and Human Activity on Runoff in the Choshui River Alluvial Fan, Taiwan

Chen

Huang

Yeh

2021

Land

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Climate factors and human activities are the leading causes of changes in the hydrological cycle. In addition to being an important part of the hydrological cycle, runoff is also an important indicator for assessing the amount of available water. Therefore, it is necessary to explore the reasons that have caused changes in runoff. In this study, the causes of runoff changes in the alluvial fan of the Choshui River from 1980–2018 are explored. Two simple methods, including a decomposition method based on the Budyko structure and a method based on climate elasticity, for which the necessary data are easy to obtain, are used to quantify the impact of climate factors and human activities on runoff changes. The results show that the runoff in the long term shows a significant transition point in 2003, where climate factors have contributed more than 90% of the change, while the influence of human activities on the changes in runoff appears to be relatively small. Moreover, the Budyko method and the Normalized Difference Vegetation Index (NDVI) show that the vegetation cover has decreased. In addition to providing a simple method to assess the causes of changes in runoff, this study also analyzes the causes of changes in the runoff of the alluvial fan of the Choshui River to provide a reference for water resource policy and land use management.

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Section: Budyko Frameworkmentioning

confidence: 99%

Quantifying the Relative Contribution of the Climate Change and Human Activity on Runoff in the Choshui River Alluvial Fan, Taiwan

Chen

Huang

Yeh

2021

Land

Self Cite

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Impacts of sugarcane expansion on water availability in a river basin in southeastern Brazil

Oliveira

Tomasella

Caram

et al. 2022

CATENA

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Baseflow Variation in Southern Taiwan Basin

et al. 2023

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Baseflow is among the most important components of streamflow. It is the main source of streamflow from groundwater systems in the dry season and also plays an important role as a water resource in the ecological environment and for human activities. In recent years, because of climate change, the number of dry season days in Taiwan has increased, and the wet season has been delayed, resulting in fewer rainy days and increased precipitation intensity. In addition, the spatial distribution of rainfall is uneven, and rivers are short and fast-flowing. Taiwan has become a country with abundant rainfall but insufficient water resources; therefore, the assessment of baseflow is important. This study selected eight basins with distinct wet and dry seasons in southern Taiwan as the study area. The baseflow characteristics and their relationships with climate features were assessed using time series analysis, baseflow attribution analysis, and wavelet analysis. The results showed that baseflow has an increasing trend; both precipitation and evapotranspiration have a significant positive correlation with baseflow, and the impact of precipitation is greater than that of evaporation. Sensitivity analysis showed that baseflow increases with increasing evaporation and precipitation; this behavior is related to the concentration of precipitation and evaporation in the wet season. Baseflow attribution analysis showed that the contribution of climate change to baseflow (75.0%) was larger than that of human activities (−2.9%), indicating that climate change was the main factor in the increase in baseflow. Wavelet analysis showed that both the El Niño–Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) are correlated with baseflow, where the PDO is more strongly correlated than the ENSO. The main timescales of the ENSO and PDO are a 4–8-year band and an 8-year band, respectively. The ENSO may have a timescale above the 8-year band, and the PDO exhibits periodic correlation changes at a 1-year band.

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Attribution of Streamflow Variations in Southern Taiwan

Cited by 3 publications

References 56 publications

Quantifying the Relative Contribution of the Climate Change and Human Activity on Runoff in the Choshui River Alluvial Fan, Taiwan

Quantifying the Relative Contribution of the Climate Change and Human Activity on Runoff in the Choshui River Alluvial Fan, Taiwan

Impacts of sugarcane expansion on water availability in a river basin in southeastern Brazil

Baseflow Variation in Southern Taiwan Basin

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