Quantitative assessment of the impacts of climate change and human activities on runoff change in a typical karst watershed, SW China

Wu, Luhua; Wang, Shijie; Bai, Xiaoyong; Luo, Weijun; Tian, Yuan; Zeng, Chaoliu; Luo, Geping; He, Shiyan

doi:10.1016/j.scitotenv.2017.05.288

Cited by 104 publications

(43 citation statements)

References 69 publications

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“…us, a higher density of weather stations may overcome the index-historical data mismatch. Previous studies [69][70][71][72][73] have stated that the occurrence of droughts in the southwestern region of Guizhou Province is close to related atmospheric circulation anomalies and special topography [69][70][71][72][73][74][75]. In addition, the signi cant decrease in precipitation [11,21] is an important factor for drought.…”

Section: Discussionmentioning

confidence: 86%

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Temporal-Spatial Characteristics of Drought in Guizhou Province, China, Based on Multiple Drought Indices and Historical Disaster Records

Cheng

Gao

Chen

et al. 2018

Advances in Meteorology

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Guizhou Province, China, experienced several severe drought events over the period from 1960 to 2013, causing great economic loss and intractable conflicts over water. In this study, the spatial and temporal characteristics of droughts are analyzed with the standard precipitation index (SPI), comprehensive meteorological drought index (CI), and reconnaissance drought index (RDI). Meanwhile, historical drought records are used to test the performance of each index at identifying droughts. All three indices show decreasing annual and autumn trends, with the latter particularly prominent. 29, 30, and 32 drought events were identified during 1960-2013 by the SPI, CI, and RDI, respectively. Continuous drought is more frequent in winter-spring and summer-autumn. ere is a significant increasing trend in drought event frequency, peak, and strength since the start of the 21st century. Drought duration indicated by CI shows longer durations in the higher-elevation region of central and western Guizhou.e corresponding drought severity is high in these regions. SPI and RDI indicate longer drought durations in the lower elevation central and eastern regions of Guizhou Province, where the corresponding drought severity is also very strong. SPI shows an increasing trend in drought duration and drought severity across most of the regions of Guizhou. In general, SPI and RDI show an increasing trend in the western Guizhou Province and a decreasing trend in central and eastern Guizhou. Comparing these three drought indices with historical records, the RDI is found to be more objective and reliable than the SPI and CI when identifying the periods of drought in Guizhou.

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Section: Discussionmentioning

confidence: 86%

“…e karst landform is also an important factor for the drought in Guizhou Province [72]. e karst topography is widely distributed in Guizhou Province, and the arable land is mainly located in the high mountains [73,74]. However, the water source for irrigation is located at the bottom of the valley.…”

Section: Discussionmentioning

confidence: 99%

Temporal-Spatial Characteristics of Drought in Guizhou Province, China, Based on Multiple Drought Indices and Historical Disaster Records

Cheng

Gao

Chen

et al. 2018

Advances in Meteorology

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“…In recent decades, the streamflow of many rivers around the world exhibited a decreasing trend because of climate change and human activity [42]. Over the past 40 years in the Central Rift Valley of Ethiopia, almost all rainfall indices have an increasing trend in the valley floor and a decreasing trend in the escarpment and highlands [43].…”

Section: Impact Of Climate Change and Human Activities On Streamflowmentioning

confidence: 99%

Quantifying the Impacts of Climate Change, Coal Mining and Soil and Water Conservation on Streamflow in a Coal Mining Concentrated Watershed on the Loess Plateau, China

Guo

Han

Yang

et al. 2019

Water

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The streamflow has declined significantly in the coal mining concentrated watershed of the Loess Plateau, China, since the 1970s. Quantifying the impact of climate change, coal mining and soil and water conservation (SWC), which are mainly human activities, on streamflow is essential not only for understanding the mechanism of hydrological response, but also for water resource management in the catchment. In this study, the trend of annual streamflow series by Mann-Kendall test has been analyzed, and years showing abrupt changes have been detected using the cumulative anomaly curves and Pettitt test. The contribution of climate change, coal mining and SWC on streamflow has been separated with the monthly water-balance model (MWBM) and field investigation. The results showed: (1) The streamflow had an statistically significant downward trend during 1955–2013; (2) The two break points were in 1979 and 1996; (3) Relative to the baseline period, i.e., 1955–1978, the mean annual streamflow reduction in 1979–1996 was mainly affected by climate change, which was responsible for a decreased annual streamflow of 12.70 mm, for 70.95%, while coal mining and SWC resulted in a runoff reduction of 2.15 mm, 12.01% and 3.05mm, 17.04%, respectively; (4) In a recent period, i.e., 1997–2013, the impact of coal mining on streamflow reduction was dominant, reaching 29.88 mm, 54.24%. At the same time, the declining mean annual streamflow induced through climate change and SWC were 13.01 mm, 23.62% and 12.20 mm, 22.14%, respectively.

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“…In China, among seven major rivers, five large rivers (Yellow River [10,23], Haihe River [2,24], Huaihe River [25,26], Liao River [21], and Songhua River [27,28]) are situated in arid and semi-arid northern China, and have been widely investigated. In contrast, attribution for runoff change in the humid and semi-humid climate zone is insufficiently studied [29]. More recently, Shen et al [21] evaluated runoff variation and its causes within the Budyko framework across 224 catchments in China, including the humid climate regions.…”

Section: Introductionmentioning

confidence: 99%

Attribution Analysis for Runoff Change on Multiple Scales in a Humid Subtropical Basin Dominated by Forest, East China

Yang

Luo

et al. 2019

Forests

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Attributing runoff change to different drivers is vital in order to better understand how and why runoff varies, and to further support decision makers on water resources planning and management. Most previous works attributed runoff change in the arid or semi-arid areas to climate variability and human activity on an annual scale. However, attribution results may differ greatly according to different climatic zones, decades, temporal scales, and different contributors. This study aims to quantitatively attribute runoff change in a humid subtropical basin (the Qingliu River basin, East China) to climate variability, land-use change, and human activity on multiple scales over different periods by using the Soil and Water Assessment Tool (SWAT) model. The results show that runoff increased during 1960–2012 with an abrupt change occurring in 1984. Annual runoff in the post-change period (1985–2012) increased by 16.05% (38.05 mm) relative to the pre-change period (1960–1984), most of which occurred in the winter and early spring (March). On the annual scale, climate variability, human activity, and land-use change (mainly for forest cover decrease) contributed 95.36%, 4.64%, and 12.23% to runoff increase during 1985–2012, respectively. On the seasonal scale, human activity dominated runoff change (accounting for 72.11%) in the dry season during 1985–2012, while climate variability contributed the most to runoff change in the wet season. On the monthly scale, human activity was the dominant contributor to runoff variation in all of the months except for January, May, July, and August during 1985–2012. Impacts of climate variability and human activity on runoff during 2001–2012 both became stronger than those during 1985–2000, but counteracted each other. The findings should help understandings of runoff behavior in the Qingliu River and provide scientific support for local water resources management.

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Quantitative assessment of the impacts of climate change and human activities on runoff change in a typical karst watershed, SW China

Cited by 104 publications

References 69 publications

Temporal-Spatial Characteristics of Drought in Guizhou Province, China, Based on Multiple Drought Indices and Historical Disaster Records

Temporal-Spatial Characteristics of Drought in Guizhou Province, China, Based on Multiple Drought Indices and Historical Disaster Records

Quantifying the Impacts of Climate Change, Coal Mining and Soil and Water Conservation on Streamflow in a Coal Mining Concentrated Watershed on the Loess Plateau, China

Attribution Analysis for Runoff Change on Multiple Scales in a Humid Subtropical Basin Dominated by Forest, East China

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