Title: | Multi-objective calibration for comparing channel sediment routing models in SWAT |
Authors: | Lu, S., N. Kayastha, H. Thodsen, A. van Griensven and H.E. Andersen |
Year: | 2014 |
Journal: | Journal of Environmental Quality |
Volume (Issue): | 43(1) |
Pages: | 110-120 |
Article ID: | |
DOI: | 10.2134/jeq2011.0364 |
URL (non-DOI journals): | |
Model: | SWAT |
Broad Application Category: | hydrologic and pollutant |
Primary Application Category: | calibration, sensitivity, and/or uncertainty analysis |
Secondary Application Category: | sediment loss and transport |
Watershed Description: | 4.28 km^2 Lillebaek on the island of Funen in Denmark |
Calibration Summary: | |
Validation Summary: | |
General Comments: | This article is part of a JEQ special SWAT section. |
Abstract: | Sediment transport is important for ecology and water quality in receiving waters. Physically based
channel erosion methods were implemented in the Soil and Water Assessment Tool version 2009
(SWAT2009) in order to improve sediment concentration (SS) results. In the study, the default simplified
Bagnold sediment routing method (EQN-0) and the physically based simplified Bagnold sediment routing
method (EQN-1) were compared with Pareto fronts from multi-objective calibration. Two SWAT models
using EQN-0 and EQN-1 were set up for a small agricultural Danish catchment, and calibrated with multiobjective
calibration on daily flow and weekly flow weighted SS (WF SS). Results showed that the Pareto
front of EQN-1 was slightly closer to the optimal point than EQN-0 in the objective space. Trade-off
between WF SS and daily flow in EQN-1 was smaller than in EQN-0. EQN-0 generated more surface
erosion to improve WF SS. EQN-1 generated more base flow to improve WF SS. EQN-1 was not dependent
on surface erosion and simulated peak and low values of WF SS better than EQN-0. Therefore EQN-1 is
more suitable than EQN-0 in modelling SS in small lowland catchments. |
Language: | English |
Keywords: | |