Calibration and validation of multi-reservoir MFD models: A case study in Lyon

The calibration and validation approach and results from a case study applying the microscopic traffic simulation tool MITSIMLab to a mixed urban-freeway network in the Brunnsviken area in the north of Stockholm, Sweden, under congested traffic conditions are described. Two important components of the simulator were calibrated: driving behavior models and travel behavior components, including origin–destination flows and the route choice model. In the absence of detailed data, only aggregate data (i.e., speed and flow measurements at sensor locations) were available for calibration. Aggregate calibration uses simulation output, which is a result of the interaction among all components of the simulator. Therefore, it is, in general, impossible to identify the effect of individual models on traffic flow when using aggregate data. The calibration approach used takes these interactions into account by iteratively calibrating the different components to minimize the deviation between observed and simulated measurements. The calibrated MITSIMLab model was validated by comparing observed and simulated measurements: traffic flows at sensor locations, point-to-point travel times, and queue lengths. A second set of measurements, taken a year after the ones used for calibration, was used at this stage. Results of the validation are presented. Practical difficulties and limitations that may arise with application of the calibration and validation approach are discussed.

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Using Automatic Calibration with Microscopic Traffic Simulation

Journal of Advanced Computational Intelligence and Intelligent Informatics ◽

10.20965/jaciii.2008.p0106 ◽

2008 ◽

Vol 12 (2) ◽

pp. 106-110

Author(s):

Iisakki Kosonen ◽

Keyword(s):

Error Function ◽

Simulation Models ◽

Automatic Calibration ◽

Microscopic Simulation ◽

Detailed Model ◽

Microscopic Traffic Simulation ◽

Calibration And Validation ◽

University Of Technology ◽

Detailed Simulation

The microscopic simulation is getting increasingly common in traffic planning and research because of the detailed analysis it can provide. The drawback of this development is that the calibration and validation of such a detailed simulation model can be very tedious. This paper summarizes the research on automatic calibration of a high-fidelity micro-simulation (HUTSIM) at the Helsinki University of Technology (TKK). In this research we used ramp operation as the case study. The automatic calibration of a detailed model requires a systematic approach. A key issue is the error-function, which provides a numeric value to the distance between simulated and measured results. Here we define the distance as combination of three distributions namely the speed distribution, gap distribution and lane distribution. We developed an automated environment that handles all the necessary operations. The system organizes the files, executes the simulations, evaluates the error and generates new parameter combinations. For searching of the parameter space we used a genetic algorithm (GA). The overall results of the research were good demonstrating the potential of using automatic processes in both calibration and validation of simulation models.

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Hydrodynamic Modeling of a Tropical Tidal River Using the Dynamic Estuary Model (DYNHYD5): A Case Study in Sibu Laut River, Sarawak, Malaysia

Modelling and Simulation in Engineering ◽

10.1155/2018/8726752 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Chen-Lin Soo ◽

Teck-Yee Ling ◽

Lee Nyanti

Keyword(s):

Field Data ◽

Model Simulation ◽

Simulated Data ◽

Hydrodynamic Modeling ◽

Tidal River ◽

Water Quality Simulation ◽

Calibration And Validation ◽

Simulated Flow ◽

Good Agreement

Application of the Dynamic Estuary Model (DYNHYD5) in a tropical tidal river is limited. The successfully calibrated and validated hydrodynamic model is valuable in subsequent water quality simulation for environmental management. Hence, a hydrodynamic modeling approach using the DYNHYD5 was conducted in a tropical tidal river in Malaysia. Samplings were conducted in the Sibu Laut River to collect the hydrology data for model simulation. The model was calibrated and validated by comparing the simulated flow and mean depth with the field data at different simulation periods of time. The results showed that the model DYNHYD5 was successfully calibrated with channel flows and mean depths and then reproduced with good agreement in validation. The observed and simulated data were linearly correlated (R2 > 0.8) with values of slope γ ranging from 0.891 to 1.204 in both calibration and validation. The Nash–Sutcliffe coefficient of efficiency (NSE) of more than 0.7 in both calibration and validation also indicated satisfactory comparison between the observed and simulated data. The result indicated that the application of the DYNHYD5 is feasible in a tropical tidal river in Malaysia.

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Simulation, calibration and validation protocols for the model 3D-CMCC-CNR-FEM: a case study in the Bonis’ watershed (Calabria, Italy)

Forest - Rivista di Selvicoltura ed Ecologia Forestale ◽

10.3832/efor2368-014 ◽

2017 ◽

Vol 14 (4) ◽

pp. 247-256 ◽

Cited By ~ 2

Author(s):

A Collalti ◽

C Biondo ◽

G Buttafuoco ◽

M Maesano ◽

T Caloiero ◽

...

Keyword(s):

Calibration And Validation

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Multi-scale Calibration and Validation of MHYDAS-Erosion for A Small Mediterranean Vineyard Catchment: A Case Study

Revue des sciences de l eau ◽

10.7202/1021980ar ◽

2014 ◽

Vol 27 (1) ◽

pp. 21-36

Author(s):

Silvio Jose Gumiere ◽

Laurence Delattre ◽

Yves Le Bissonnais ◽

Bruno Cheviron ◽

Abir Ben Slimane ◽

...

Keyword(s):

Soil Loss ◽

Expert Knowledge ◽

Physical Parameters ◽

Calibration And Validation ◽

Multi Scale ◽

Spatially Distributed ◽

Scale Calibration ◽

Parameter Values ◽

Total Discharge

Abstract In this work we present a case study of the multi-scale calibration and validation of MHYDAS-Erosion applied to a Mediterranean vineyard. The calibration was performed using expert knowledge in linking physical parameters to land uses with the automatic parameter estimation software PEST. MHYDAS-Erosion was calibrated and validated using spatially distributed observations on total discharge and soil loss. Calibration has been performed within six rainfall events; both hydrological and erosion parameters were calibrated using RMSE, R2 and the modified version of the Nash-Sutcliffe model efficiency criteria. Calibration results indicate there was good agreement between simulated and observed total discharge and total soil loss at the seven observation points (modified Nash-Sutcliffe efficiency (mNSE) ranging between 0.89 and 0.95). Acceptable results were obtained in terms of parameter values, identification of their physical meaning and coherence. However, some limitations were also identified, and could be remedied in more detailed studies involving (i) spatially-distributed rainfall on the catchment, (ii) a description of groundwater exfiltration and (iii) spatially-distributed properties of the ditches over the catchment. Validation results were quite satisfactory for three of the four validation events. The results from this case study suggest that MHYDAS-Erosion may need a specific calibration when applied to another catchment, but once it is calibrated, it could be used for multi-scale soil loss forecasting.

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