Title: | Calibration of spatially distributed hydrological processes and model parameters in SWAT using remote sensing data and an auto-calibration procedure: A case study in a Vietnamese River Basin |
Authors: | Ha, L.T., W.G.M. Bastiaanssen, A. van Griensven, A.I.J.M. van Dijk and G.B. Senay |
Year: | 2018 |
Journal: | Water |
Volume (Issue): | 10(2) |
Pages: | |
Article ID: | 212 |
DOI: | 10.3390/w10020212 |
URL (non-DOI journals): | |
Model: | SWAT |
Broad Application Category: | hydrologic only |
Primary Application Category: | calibration, sensitivity, and/or uncertainty analysis |
Secondary Application Category: | evapotranspiration assessment |
Watershed Description: | 6,300 km^2 Day River, a tributary of the Red River located somewhere in Vietnam. |
Calibration Summary: | |
Validation Summary: | |
General Comments: | |
Abstract: | In this paper, evapotranspiration (ET) and leaf area index (LAI) were used to calibrate
the SWAT model, whereas remotely sensed precipitation and other climatic parameters were used
as forcing data for the 6300 km2 Day Basin, a tributary of the Red River in Vietnam. The efficacy
of the Sequential Uncertainty Fitting (SUFI-2) parameter sensitivity and optimization model was
tested with area specific remote sensing input parameters for every Hydrological Response Units
(HRU), rather than with measurements of river flow representing a large set of HRUs, i.e., a bulk
calibration. Simulated monthly ET correlations with remote sensing estimates showed an R2 = 0.71,
Nash–Sutcliffe Efficiency NSE = 0.65, and Kling Gupta Efficiency KGE = 0.80 while monthly LAI
showed correlations of R2 = 0.59, NSE = 0.57 and KGE = 0.83 over a five-year validation period.
Accumulated modelled ET over the 5-year calibration period amounted to 5713 mm compared to
6015 mm of remotely sensed ET, yielding a difference of 302 mm (5.3%). The monthly flow at two flow
measurement stations were adequately estimated (R2 = 0.78 and 0.55, NSE = 0.71 and 0.63, KGE = 0.59
and 0.75 for Phu Ly and Ninh Binh, respectively). This outcome demonstrates the capability of SWAT
model to obtain spatial and accurate simulation of eco-hydrological processes, also when rivers are
ungauged and the water withdrawal system is complex. |
Language: | English |
Keywords: | hydrological ecosystem services; auto-calibration; evapotranspiration; SWAT |