Variation of Precipitation and Streamflow in the Upper and Middle Huaihe River Basin, China, from 1959–2009

An, Guiyang; Hao, Zhenchun

doi:10.2112/si80-010.1

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…Climate change is likely to make hydrological regimes more extreme, with wet seasons becoming wetter and dry seasons becoming drier. The runoff from the upper and middle HRB has decreased over the last 60 years because of regional climate change and human activities, implying that the risks and intensity of droughts have increased (An & Hao 2017). Consecutive dry years, such as those occurring from 2011 to 2013, will probably occur more frequently in the future.…”

Section: Introductionmentioning

confidence: 99%

Annual nitrate load patterns in an agricultural watershed in consecutive dry years

Chen

Ruan

2021

Hydrology Research

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Nitrate (NO3-N) load characteristics in consecutive dry years in the Huai River Basin (HRB), China, were examined using streamflow and NO3-N concentration data. The data set spanned 12 years including three consecutive dry years. Baseflow separation, load estimation, and nonparametric linear regression were applied to separate point source (PS), baseflow, and surface runoff NO3-N loads from the total load. The mean annual nonpoint source (NPS) load was 2.84 kg·ha−1·yr−1, accounting for 90.8% of the total load. Baseflow contributed approximately one-fourth of the natural runoff and half of the NPS load. The baseflow nitrate index (i.e., the ratio of baseflow NO3-N load to total NPS NO3-N load) was 25.4% higher in consecutive dry years than in individual dry years. This study demonstrated that baseflow is the preferential hydrological pathway for NO3-N transport in the HRB and that baseflow delivers a higher NO3-N percentage to streams under long-term drought than under short-term drought. This study highlights the alarming evidence that continuous drought caused by climate change may lead to a higher rate of nitrogen loss in agricultural watersheds.

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Section: Introductionmentioning

confidence: 99%

Annual nitrate load patterns in an agricultural watershed in consecutive dry years

Chen

Ruan

2021

Hydrology Research

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“…However, apart from Chen (2013) and Chen, Ruan, and Shan (2017), who estimated the nitrate loads in groundwater discharges using numerical models in a small sub-basin, few have reported the long-term nitrate loads in streamflow and quantified the contribution made by baseflow in this area. In addition, the runoff from the upper and middle reaches of the Huaihe River Basin has decreased significantly over the last 50 years, because of regional climate change and human activities (An & Hao, 2017;Yan et al, 2014;Zhang, Shao, Xia, Bunn, & Zuo, 2011), meaning that the risks and intensity of droughts have increased (Wang, Zhang, & Singh, 2016), and consecutive dry years, as occurred from 2011 to 2013 (see supporting information), will probably occur more frequently in the future. The objectives of this study, therefore, were to (1) quantify the total nitrate loads exported from this agricultural watershed and quantify the contribution from baseflow, (2) evaluate the temporal patterns of nitrate loads in consecutive dry years, and (3) identify the main pathway of nitrate transport.…”

Section: Introductionmentioning

confidence: 99%

Patterns of nitrate transport in an agricultural watershed through consecutive dry years

chen¹,

Ruan²

2020

Preprint

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Recently, because of regional climate changes and human activities, the risk and intensity of droughts in the upper and middle Huaihe River Basin, China, have increased. These changes in rainfall may have, in turn, had an influence on the pathways of nitrate transport in this predominantly agricultural watershed. In this study, the characteristics of nitrate transport over consecutive dry years in this watershed were examined using records of streamflow and nitrate concentration data that spanned a period of 12 years (2007-2018) that included 3 consecutive dry years (2011)(2012)(2013). The baseflow was separated from the streamflow using a digital filter method and the nitrate loads were estimated using a regression method. The annual discharge and nitrate load in streamflow and baseflow averaged 23.5 billion m 3 and 41.9 kiloton (kt), and 7.4 billion m 3 and 14.7 kt, respectively. Baseflow contributed more to the total discharge and total nitrate load in the consecutive dry years (41.0% of the total discharge and 56.2% of the total nitrate load) than in wet, normal, and single dry years. Averaged over the whole study period, the monthly baseflow nitrate index (BFNI) was higher than 50% in the dry season and lower than 30% in the flood season. Over the study period, the annual baseflow enrichment ratio (BER) ranged from 0.94 to 1.46 and averaged 1.13, and was highest (1.46) in the consecutive dry years. The results suggest that nitrate was mainly transported to surface water via baseflow during dry conditions and that this process was particularly important during the consecutive dry years. Therefore, to protect surface water, measures should be urgently implemented to control nitrate transport in groundwater during consecutive dry years.

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“…e hydrological elements have changed a lot in response to the global climate change in the Huai River basin (HRB) [7][8][9][10]. e extreme precipitation events in this region have also become one of the hot topics of scholars in hydrology and meteorology.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Changes and Frequency Analysis of Multiday Extreme Precipitation in the Huai River Basin during 1960 to 2014

Yin

Pan

Yang

et al. 2019

Advances in Meteorology

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Floods and droughts are more closely related to the extreme precipitation over longer periods of time. The spatial and temporal changes and frequency analysis of 5-day and 10-day extreme precipitations (PX5D and PX10D) in the Huai River basin (HRB) are investigated by means of correlation analysis, trend and abrupt change analysis, EOF analysis, and hydrological frequency analysis based on the daily precipitation data from 1960 to 2014. The results indicate (1) PX5D and PX10D indices have a weak upward trend in HRB, and the weak upward trend may be due to the significant downward trend in the 21st century, (2) the multiday (5-day and 10-day) extreme precipitation is closely associated with flood/drought disasters in the HRB, and (3) for stations of nonstationary changes with significant upward trend after the abrupt change, if the whole extreme precipitation series are used for frequency analysis, the risk of future floods will be underestimated, and this effect is more pronounced for longer return periods.

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Variation of Precipitation and Streamflow in the Upper and Middle Huaihe River Basin, China, from 1959–2009

Cited by 9 publications

References 37 publications

Annual nitrate load patterns in an agricultural watershed in consecutive dry years

Annual nitrate load patterns in an agricultural watershed in consecutive dry years

Patterns of nitrate transport in an agricultural watershed through consecutive dry years

Spatiotemporal Changes and Frequency Analysis of Multiday Extreme Precipitation in the Huai River Basin during 1960 to 2014

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