Sciences in Cold and Arid Regions ›› 2020, Vol. 12 ›› Issue (2): 104-118.doi: 10.3724/SP.J.1226.2020.00104.

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The heterogeneity of hydrometeorological changes during the period of 1961-2016 in the source region of the Yellow River, China

ZhiXiang Lu1,Qi Feng1(),SongBing Zou1,JiaLi Xie2,3,ZhenLiang Yin1,Fang Li1,3   

  1. 1.Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
    2.Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
    3.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-06-11 Accepted:2019-10-08 Online:2020-04-30 Published:2020-04-27
  • Contact: Qi Feng E-mail:qifeng@lzb.ac.cn

Abstract:

Runoff in the source region of a river makes up most of water resources in the whole basin in arid and semi-arid areas. It is very important for water resources management to timely master the latest dynamic changes of the runoff and quantitatively reveal its main driving factors. This paper aims to discover the variation heterogeneity of runoff and the impacts of climatic factors on this runoff in the source region of the Yellow River (SRYR) in China from 1961 to 2016. We divided SRYR into four sub-regions, and analyzed changes of their contributions to total runoff in SRYR. We also revealed the impacts of precipitation, temperature and potential evapotranspiration on runoff in each sub-region by constructing the regression relationships between them at multiple temporal scales. The changes of runoff in the four sub-regions and their contributions to the total runoff were not exactly consistent. The climatic variables’ changes also have heterogeneity, and runoff was mainly affected by precipitation compared to influences of temperature or potential evapotranspiration. Their impacts on runoff have spatiotemporal heterogeneity and can be reflected by very significant-linear regression equations. It provided a simple method to predict headwater runoff for better water management in the whole basin.

Key words: source region of the Yellow River, hydrometeorology, spatiotemporal variation, runoff contribution, heterogeneity

Figure 1

The location of SRYR, sub-regions and hydrometeorological stations"

Figure 2

A conceptual framework for analyzing the heterogeneity of hydrometeorological changes"

Table 1

The hydrological, topographical and climatic characteristics of sub-regions"

RegionDEM (m)Mean altitude (m)Area (km2)Hydrological stationMeteorological station
D14,210-5,2454,50220,930HHYMaduo
D23,941-5,3544,42624,089HHY, JMMaduo, Dari
D33,406-5,3283,88141,029JM, MQDari, Hongyuan, Jiuzhi, Ruoergai
D42,680-6,2483,95335,924MQ, TNHGuoluo, Xinghai, Guinan

Figure 3

Annual time series of runoff (a) and the contributions of runoff (b) in four regions to the total in SRYR for the period of 1961-2016 (Dashed lines are the linear trends)"

Figure 4

Decadal series of annual and seasonal runoff in four regions and their contributions to the total in SRYR during 1961-2016 (a and d for annual runoff and its contribution; b and e for runoff in wet/warm season and its contribution; c and f for runoff in dry/cold season and its contribution)"

Figure 5

Decadal variances of monthly runoff in four regions (a-d) and their contributions (e-h) to the total SRYR during 1961-2016"

Figure 6

Annual time series of normalized averaged runoff, precipitation, temperature, and ET0 for the sub-regions of D1 (a), D2 (b), D3 (c), and D4 (d) for the period 1961-2016 (Dashed lines are the linear trends)"

Table 2

The regression correlations between normalized yearly runoff and precipitation, temperature, and ET0"

ItemRegionEquationR2Significance FP-value of independent variables
R&P, TD1R=0.45P-0.29T0.220.00130.0007; 0.0254
D2R=0.71P-0.15T0.470.00000.0000; 0.1460
D3R=0.87P-0.37T0.810.00000.0000; 0.0000
D4R=0.73P-0.25T0.580.00000.0000; 0.0065
R&P, ET0D1R=0.45P-0.29ET00.260.00030.0019; 0.0056
D2R=0.69P-0.27ET00.520.00000.0000; 0.0073
D3R=0.8P-0.41ET00.840.00000.0000; 0.0000
D4R=0.62P-0.28ET00.590.00000.0000; 0.0041

Figure 7

Decadal series of region-averaged annual runoff, precipitation, temperature, and ET0 for the four regions during 1961-2016"

Table 3

Regression correlations between annual runoff and precipitation, temperature, and ET0 in decadal scale"

ItemRegionEquationR2Significance FP-value of independent variables
R&P, TD1R=0.46P-16.7T-171.760.160.7700.58; 0.51
D2R=0.22P-6.9T+30.640.080.8800.68; 0.65
D3R=0.84P-37.2T-288.250.940.0160.023; 0.016
D4R=1.28P-28T-405.310.650.2000.12; 0.20
R&P, ET0D1R=0.5P-0.22ET0+190.680.290.6000.44; 0.36
D2R=0.51P-0.19ET0+196.220.270.6200.40; 0.37
D3R=0.9P-0.48ET0+403.920.930.0180.02; 0.018
D4R=1.25P-0.47ET0+398.170.680.1800.11; 0.17

Figure 8

Decadal series of region-averaged seasonal runoff, precipitation, temperature, and ET0 (a-d for wet-/warm season, and e-h for dry/cold season) for the four regions during 1961-2016"

Figure 9

Decadal series of region-averaged monthly runoff, precipitation, temperature, and ET0 for the four regions during 1961-2016"

Table 4

The regression correlations between monthly runoff and precipitation, temperature, and ET0"

ItemRegionEquationR2Significance FP-value of independent variables
R&P, TD1R=0.006P+0.085T+3.060.220.00020.74; 0.14
D2R=0.16P+0.33T+6.490.820.00000.0000; 0.03
D3R=0.27P-0.09T+5.240.720.00000.0000; 0.81
D4R=0.2P-0.0052T+5.840.740.00000.0000; 0.98
R&P, ET0D1R=0.01P+0.03ET0-10.270.00000.31; 0.001
D2R=0.19P+0.11ET0-8.30.840.00010.0000; 0.0001
D3R=0.24P-0.14ET0-11.180.740.00000.0000; 0.05
D4R=0.19P-0.05ET0-10.740.00000.0000; 0.11
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