Characterize groundwater vulnerability to intensive groundwater exploitation using tritium time-series and hydrochemical data in Shijiazhuang, North China Plain

2021 ◽  
Vol 603 ◽  
pp. 126953
Author(s):  
Zhongshuang Cheng ◽  
Chen Su ◽  
Zhaoxian Zheng ◽  
Zongyu Chen ◽  
Wen Wei
Keyword(s):  
Time Series ◽  
North China Plain ◽  
North China ◽  
Groundwater Vulnerability ◽  
Groundwater Exploitation ◽  
Hydrochemical Data

Monitoring regional agricultural water use efficiency for Hebei Province on the North China Plain

2002 ◽  
Vol 53 (1) ◽  
pp. 55 ◽  
Author(s):  
Tim R. McVicar ◽  
Guanglu Zhang ◽  
Andrew S. Bradford ◽  
Huixiao Wang ◽  
Warrick R. Dawes ◽  
...  
Keyword(s):  
Time Series ◽  
Water Use Efficiency ◽  
Water Use ◽  
North China Plain ◽  
North China ◽  
Agricultural Practices ◽  
Water Saving ◽  
Agricultural Water ◽  
Agricultural Water Use ◽  
Use Efficiency

Increasing competition for water in China, due to industrialisation of its economy and urbanisation of its population, has led to the introduction of water-saving agricultural practices in an attempt to increase agricultural water use efficiency (Ag WUE). This study was conducted to assess whether changes in management practices have increased regional Ag WUE for a focus area covering 20% of the 300 000 km2 North China Plain (NCP). An ‘input–output’ definition of regional Ag WUE was used, where ‘input’ is the water available over the crop growing season and ‘output’ is grain yield. Regional databases of precipitation, irrigation, and yield from 1984 to 1996 were established in a Geographic Information System (GIS) to calculate winter wheat and summer corn Ag WUE on a county basis. For wheat, the average Ag WUE was 7.0 kg/ha.mm in 1984, whereas in 1996 it was 14.3 kg/ha.mm. For corn, Ag WUE increased from 9.0 kg/ha.mm in 1984 to 10.1 kg/ha.mm in 1996, although values >11.5 kg/ha.mm were obtained for both 1991 and 1992. Time series plots of the resulting Ag WUE, and its components, were generated to reveal spatial and temporal variability. Counties with a relatively high mean Ag WUE in combination with low year-to-year consistency have been identified as those with the highest potential for improving Ag WUE management. Total county water resources (WR) were also calculated for the time series, and county-basis normalisation of Ag WUE and WR also showed that there have been recent improvements in Ag WUE. For some counties in wet years, there may be an opportunity to plant larger areas of crop to increase county level Ag WUE. For the focus study site (and for the time series data available), it is most likely that recently introduced water-saving agricultural practices in the NCP are associated with improvements to Ag WUE.

Precise identification of maize in the North China Plain based on Sentinel-1A SAR time series data

2018 ◽  
Vol 40 (5-6) ◽  
pp. 1996-2013 ◽  
Author(s):  
Li Li ◽  
Qingling Kong ◽  
Pengxin Wang ◽  
Lan Xun ◽  
Lei Wang ◽  
...  
Keyword(s):  
Time Series ◽  
North China Plain ◽  
North China ◽  
Time Series Data ◽  
Series Data ◽  
The North ◽  
The North China Plain ◽  
Precise Identification

scholarly journals Detecting seasonal and long-term vertical displacement in the North China Plain using GRACE and GPS

2017 ◽  
Vol 21 (6) ◽  
pp. 2905-2922 ◽  
Author(s):  
Linsong Wang ◽  
Chao Chen ◽  
Jinsong Du ◽  
Tongqing Wang
Keyword(s):  
North China Plain ◽  
North China ◽  
Vertical Displacement ◽  
Series Data ◽  
Eastern Region ◽  
Tectonic Movement ◽  
Groundwater Exploitation ◽  
The North ◽  
The North China Plain ◽  
Mass Load

Abstract. In total, 29 continuous Global Positioning System (GPS) time series data together with data from Gravity Recovery and Climate Experiment (GRACE) are analysed to determine the seasonal displacements of surface loadings in the North China Plain (NCP). Results show significant seasonal variations and a strong correlation between GPS and GRACE results in the vertical displacement component; the average correlation and weighted root-mean-squares (WRMS) reduction between GPS and GRACE are 75.6 and 28.9 % respectively, when atmospheric and non-tidal ocean effects were removed, but the annual peak-to-peak amplitude of GPS (1.2–6.3 mm) is greater than the data (1.0–2.2 mm) derived from GRACE. We also calculate the trend rate as well as the seasonal signal caused by the mass load change from GRACE data; the rate of GRACE-derived terrestrial water storage (TWS) loss (after multiplying by the scaling factor) in the NCP was 3.39 cm yr−1 (equivalent to 12.42 km3 yr−1) from 2003 to 2009. For a 10-year time span (2003 to 2012), the rate loss of TWS was 2.57 cm yr−1 (equivalent to 9.41 km3 yr−1), which is consistent with the groundwater storage (GWS) depletion rate (the rate losses of GWS were 2.49 and 2.72 cm yr−1 during 2003–2009 and 2003–2012 respectively) estimated from GRACE-derived results after removing simulated soil moisture (SM) data from the Global Land Data Assimilation System (GLDAS)/Noah model. We also found that GRACE-derived GWS changes are in disagreement with the groundwater level changes from observations of shallow aquifers from 2003 to 2009, especially between 2010 and 2013. Although the shallow groundwater can be recharged from the annual climate-driven rainfall, the important facts indicate that GWS depletion is more serious in deep aquifers. The GRACE-derived result shows an overall uplift in the whole region at the 0.37–0.95 mm yr−1 level from 2004 to 2009, but the rate of change direction is inconsistent in different GPS stations at the −0.40–0.51 mm yr−1 level from 2010 to 2013. Then we removed the vertical rates, which are induced by TWS from GPS-derived data, to obtain the corrected vertical velocities caused by tectonic movement and human activities. The results show that there are uplift areas and subsidence areas in NCP. Almost the whole central and eastern region of NCP suffers serious ground subsidence caused by the anthropogenic-induced groundwater exploitation in the deep confined aquifers. In addition, the slight ground uplifts in the western region of NCP are mainly controlled by tectonic movement (e.g. Moho uplifting or mantle upwelling).

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