Spatial and Temporal Streamflow Trends in Northern Taiwan

Yeh, Chih-Hung; Wang, Jinge; Yeh, H. C.; Lee, Cheng Haw

doi:10.3390/w7020634

Cited by 45 publications

(34 citation statements)

References 26 publications

(28 reference statements)

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“…The hydroclimatic variables analyzed generally include precipitation amount, surface air temperature, evapotranspiration, and streamflow [8][9][10][11][12]. The previous precipitation studies have focused mainly on changes in annual or monthly precipitation amounts and have ignored changes in precipitation structure including precipitation amount, mean precipitation intensity, and precipitation frequency.…”

Section: Introductionmentioning

confidence: 99%

“…At present, some studies related to trend analysis of hydroclimatic variables at watershed scale have been carried out, for example in the Lake Victoria Basin in East Africa [5], the Yellow River Basin [6], and the Three Gorges Reservoir [7]. The hydroclimatic variables analyzed generally include precipitation amount, surface air temperature, evapotranspiration, and streamflow [8][9][10][11][12]. The previous precipitation studies have focused mainly on changes in annual or monthly precipitation amounts and have ignored changes in precipitation structure including precipitation amount, mean precipitation intensity, and precipitation frequency.…”

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Changes in Temperature, Precipitation, and Streamflow in the Miyun Reservoir Basin of China

Yan

Bai

2017

Water

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With the influence of global climate warming, the responses of regional hydroclimatic variables to climate change are of great importance for water resource planning and management. The evolution of precipitation, mean temperature, and runoff at different timescales, was investigated using the Mann-Kendall test from 1969 to 2011 in the Miyun Reservoir Basin, China. In addition, three precipitation indices and different precipitation grades were also considered. Annual precipitation had a non-significant decreasing trend, flood precipitation trend was significantly decreasing with a magnitude of 18.50 mm/10 years, and non-flood precipitation trend was significantly increasing with a magnitude of 6.91 mm/10 years. Precipitation frequency in flood season featured a significantly decreasing trend. Meanwhile, flood precipitation intensity for large rain (25 ≤ p < 50 mm/day) and non-flood precipitation amount for medium rain (10 ≤ p < 25 mm/day) also showed significant increasing trends. The mean temperature exhibited significant upward trends during the year, in flood season, and in non-flood season with rates of 0.36 • C/10 years, 0.32 • C/10 years and 0.38 • C/10 years, respectively. The magnitude of the mean temperature increase in the non-flood season was greater than in the flood season. Runoff experienced continuous and significant downward trends of 1.6 × 10 8 m 3 /10 years, 1.1 × 10 8 m 3 /10 years and 0.40 × 10 8 m 3 /10 years, respectively, during the year, in flood season, and in non-flood season. The decreased annual streamflow was more obvious after 2000 than before. The results obtained in this study could be used as references for decision-making regarding water resource management in the watershed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Changes in Temperature, Precipitation, and Streamflow in the Miyun Reservoir Basin of China

Yan

Bai

2017

Water

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“…It is shown that the distributions of streamflow and precipitation have similar trends in each month; in months with greater precipitation, there is also an increase in streamflow volume. Yeh et al [33] used the Mann-Kendall test to analyze the streamflow data recorded over 30 years from 12 gauge stations in the northern region, which are not affected by artificial water conservancy facilities, in order to explore the streamflow trend characteristics in the northern region. Table 2 and Figure 2 respectively show the details and spatial distribution of these stations.…”

Section: Study Areamentioning

confidence: 99%

“…Therefore, in order to lower the impact of climate change on water usage, effective study and management of the hydrological information in the northern region is necessary. Yeh et al [33] used the Mann-Kendall test, Theil-Sen estimator, Mann-Whitney-Pettit test and the cumulative deviation test to investigate the streamflow trend characteristics in northern Taiwan. The Mann-Kendall test was used to analyze the streamflow trend [34][35][36][37][38][39], and the Theil-Sen estimator was used to calculate the trend slopes to obtain the extent of trend changes [40][41][42][43][44].The Mann-Whitney-Pettit test and the cumulative deviation test, two tests commonly used in hydrology analyses, are used to find the change points [43,[45][46][47].…”

mentioning

confidence: 99%

“…The Mann-Kendall test was used to analyze the streamflow trend [34][35][36][37][38][39], and the Theil-Sen estimator was used to calculate the trend slopes to obtain the extent of trend changes [40][41][42][43][44].The Mann-Whitney-Pettit test and the cumulative deviation test, two tests commonly used in hydrology analyses, are used to find the change points [43,[45][46][47]. Yeh et al [33] found from long-term streamflow data that the average annual streamflow in the Lanyang River basin had a significant downward trend. Therefore, in this study, SDI was used to study the long-term distribution of drought events in northern Taiwan.…”

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confidence: 99%

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SDI and Markov Chains for Regional Drought Characteristics

et al. 2015

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Abstract:In recent years, global climate change has altered precipitation patterns, causing uneven spatial and temporal distribution of precipitation that gradually induces precipitation polarization phenomena. Taiwan is located in the subtropical climate zone, with distinct wet and dry seasons, which makes the polarization phenomenon more obvious; this has also led to a large difference between river flows during the wet and dry seasons, which is significantly influenced by precipitation, resulting in hydrological drought. Therefore, to effectively address the growing issue of water shortages, it is necessary to explore and assess the drought characteristics of river systems. In this study, the drought characteristics of northern Taiwan were studied using the streamflow drought index (SDI) and Markov chains. Analysis results showed that the year 2002 was a turning point for drought severity in both the Lanyang River and Yilan River basins; the severity of rain events in the Lanyang River basin increased after 2002, and the severity of drought events in the Yilan River basin exhibited a gradual upward trend. In the study of drought severity, analysis results from periods of three months (November to January) and six months (November to April) have shown significant drought characteristics. In addition, analysis of drought occurrence probabilities using the method of Markov chains has shown that the occurrence probabilities of drought events are higher in the Lanyang River basin than in the Yilan River basin; particularly for extreme events, the occurrence probability of an extreme drought event is 20.6% during the dry season (November to April) in the Lanyang River basin, and 3.4% in the Yilan River basin. This study shows that for analysis of drought/wet occurrence probabilities, the results obtained for the drought frequency and occurrence OPEN ACCESSSustainability 2015, 7 10790 probability using short-term data with the method of Markov chains can be used to predict the long-term occurrence probability of drought/wet events.

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Spatio‐temporal variability of extreme precipitation in Nepal

Talchabhadel

Karki

Thapa³

et al. 2018

Intl Journal of Climatology

131

106

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Nepal is one of the most vulnerable countries to climate change impacts. Extreme weather events associated with heavy precipitations are the principal causes of landslides, debris flows and all types of floods disasters in the country, which by causing tremendous losses of life and property affects the socio-economic development. Given the limited availability of knowledge in spatio-temporal distribution of precipitation in Nepal, this study analyses the spatial distribution of monthly and annual precipitation and 1-day extreme precipitation and their trends utilizing a large number of stations (291 stations for the first time) distributed across the country for the period of 1966-2015. This study focuses on the exploration of elevational dependencies of precipitation to demonstrate the effect of topographic heterogeneity caused by the numbers of broad and narrow river valleys and mountain slopes and ridges. Also, this study investigates the relation of 1-day extreme precipitation with mean annual precipitation. Our results show the peak annual precipitation elevation between 2,000 and 3,500 m above sea level, while in contrast 1-day extreme precipitation peaks are found at lower elevation in the southern foothills with its highest intensity in a central region of the country. The occurrence of 10% of mean annual precipitation in a single day has been observed in 75% of the analysed stations which in turn indicates the high likelihoods of initiation of landslides, soil erosions and floods in different parts of the country. There is no definitive countrywide decadal trend in extreme precipitation intensity and occurrence. A station-wise trend clearly shows the increase in extreme precipitation events in western mountainous regions in the recent decades. In other locations, the mixed patterns of station-wise increasing and decreasing trends are found.

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Spatial and Temporal Streamflow Trends in Northern Taiwan

Cited by 45 publications

References 26 publications

Spatial and Temporal Changes in Temperature, Precipitation, and Streamflow in the Miyun Reservoir Basin of China

Spatial and Temporal Changes in Temperature, Precipitation, and Streamflow in the Miyun Reservoir Basin of China

SDI and Markov Chains for Regional Drought Characteristics

Spatio‐temporal variability of extreme precipitation in Nepal

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