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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

Postal Subscription Code 80-963

2018 Impact Factor: 1.205

Front. Earth Sci.    2017, Vol. 11 Issue (3) : 592-600    https://doi.org/10.1007/s11707-017-0656-x
RESEARCH ARTICLE
A comparison of single- and multi-site calibration and validation: a case study of SWAT in the Miyun Reservoir watershed, China
Jianwen BAI, Zhenyao SHEN(), Tiezhu YAN
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
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Abstract

An essential task in evaluating global water resource and pollution problems is to obtain the optimum set of parameters in hydrological models through calibration and validation. For a large-scale watershed, single-site calibration and validation may ignore spatial heterogeneity and may not meet the needs of the entire watershed. The goal of this study is to apply a multi-site calibration and validation of the Soil and Water Assessment Tool (SWAT), using the observed flow data at three monitoring sites within the Baihe watershed of the Miyun Reservoir watershed, China. Our results indicate that the multi-site calibration parameter values are more reasonable than those obtained from single-site calibrations. These results are mainly due to significant differences in the topographic factors over the large-scale area, human activities and climate variability. The multi-site method involves the division of the large watershed into smaller watersheds, and applying the calibrated parameters of the multi-site calibration to the entire watershed. It was anticipated that this case study could provide experience of multi-site calibration in a large-scale basin, and provide a good foundation for the simulation of other pollutants in follow-up work in the Miyun Reservoir watershed and other similar large areas.

Keywords calibration      soil and water assessment tool      Miyun Reservoir      multi-site     
Corresponding Author(s): Zhenyao SHEN   
Just Accepted Date: 19 April 2017   Online First Date: 19 May 2017    Issue Date: 12 July 2017
 Cite this article:   
Jianwen BAI,Zhenyao SHEN,Tiezhu YAN. A comparison of single- and multi-site calibration and validation: a case study of SWAT in the Miyun Reservoir watershed, China[J]. Front. Earth Sci., 2017, 11(3): 592-600.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-017-0656-x
https://academic.hep.com.cn/fesci/EN/Y2017/V11/I3/592
Fig.1  Location of the study watershed and the hydrological sites.
Data typeData descriptionSource
Digital elevation modelElevation, overland and channel slopes and lengths (1:250,000)The National Geomatics Center of China
Land useLand use classifications (1:100,000)Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences
Soil propertiesPhysical and chemical properties of soils
(1:1,000,000)
Institute of Soil Science, Chinese Academy of Sciences
Weather dataPrecipitation, relative humidity, daily maximum and minimum air temperature, wind speed
and solar radiation
China Meteorological Administration
HydrologyRainfall (2006–2010), flow (2006–2010)Hydrological yearbook
Management practicesPlanting, harvest, and tillage operationsField investigations
Tab.1  The type and sources of available data in the Miyun watershed
WatershedSubwatershedNo. of SubbasinsArea/km2
Baihe RiverSandaoying SDY)111532
Xiabao XB)254089
Remaining basin (RB)233475
Zhangjiafen ZJF)599096
Tab.2  Basin characteristics of Baihe Watershed
No.Variable nameDescription
1CN2.mgtCurve number II
2ESCO.hruSoil evaporation compensation factor
3CH_N2.rteManning’s ‘n’ value for the main channel
4CH_K2.rteEffective hydraulic conductivity in main channel alluvium (mm/h)
5SOL_AWC.solAvailable soil water capacity
6SOL_K.solSoil hydraulic conductivity (mm/h)
7EPCO.hruPlant uptake compensation factor
8SLSUBBSN.hruAverage slope length (m)
9ALPHA_BF.gwBase flow recession constant
10GW_DELAY.gwGroundwater delay (days)
11CANMX.hruMaximum canopy storage (mm)
12Rchrg_Dp.gwDeep aquifer percolation fraction
13SURLAG.bsnSurface runoff lag coefficient
14SOL_BD.solMoist bulk density (mg/m3)
Tab.3  Selected parameters of the three sites for calibration
WatershedCalibration (2006?2007)Validation(2008?2010)
R2ENSR2ENS
SDY0.730.630.870.79
XB0.720.120.750.63
ZJF(single- site)0.540.520.590.54
Multi-site0.590.560.590.57
Tab.4  The ENS and R2 values of different sites in the calibration and validation periods
Fig.2  Observed and simulated flow of Sandaoying from 2006 to 2010.
Fig.3  Observed and simulated flow of Xiabao from 2006 to 2010.
Fig.4  Observed and simulated flow of Zhangjiafen from 2006 to 2010.
Fig.5  Observed and simulated flow of single- and multi-sites.
Variable NameBest adjustment value
SDYXBZJF
CN2 (maximum value)92.038.469.0
CH_K214.621.191.62
SOL_K (maximum value)40.551.9124.6
EPCO0.501.000.33
SOL_BD (maximum value)1.422.042.02
Tab.5  The parameter values showing the greatest differences for the three sites in SWAT
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