A comparative assessment of awbm and simhyd for forested watersheds
This presentation is the property of its rightful owner.
Sponsored Links
1 / 23

A comparative assessment of AWBM and SimHyd for forested watersheds PowerPoint PPT Presentation


  • 86 Views
  • Uploaded on
  • Presentation posted in: General

A comparative assessment of AWBM and SimHyd for forested watersheds. Bofu Yu 1 , Zhongli Zhu 2 1 School of Engineering, Griffith University, Australia 2 School of Geography, Beijing Normal University, China. Background.

Download Presentation

A comparative assessment of AWBM and SimHyd for forested watersheds

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


A comparative assessment of awbm and simhyd for forested watersheds

A comparative assessment of AWBM and SimHyd for forested watersheds

Bofu Yu1, Zhongli Zhu2

1School of Engineering, Griffith University, Australia

2School of Geography, Beijing Normal University, China


Background

Background

  • Workshop objective: to apply and evaluate model performance in simulating‘non-stationary’ hydrologic time series;

  • Climate and streamflow data were provided for 14 watersheds/catchments around the world;

  • Protocol was stipulated for consistency for all modellers;

  • AWBM and SimHyd are by far the most commonly used models for streamflow estimation in Australia;

  • Two smallest of the 14 watersheds/catchments were selected for comparison purposes.


Two models

Two models


A comparative assessment of awbm and simhyd for forested watersheds

AWBM


Simhyd

SimHyd


Model comparison

Model comparison

With default parameter values for

AWBM and SimHyd, and

max. retention value of 105mm

for the SCS Curve Number method,

all models show a non-linear

relationship between rain excess

and runoff.

NB: All the ‘stores’ in AWBM and

SimHyd were assumed to be half

full initially.


Two watersheds

Two watersheds


A comparative assessment of awbm and simhyd for forested watersheds

- watersheds applied

- models developed


Working hypotheses

Working Hypotheses

  • None of the 2 models is going to work;

  • Conceptual models would perform better for watersheds with a higher runoff coefficient and (for these 2) with less snow fall


Two watersheds1

Two watersheds


A comparative assessment of awbm and simhyd for forested watersheds

Model comparisonin terms of the N-S coefficient of efficiency for 30 calibration-validation combinations

There is a much larger difference

between watersheds than between models!!


Model performance in terms of nse between 2 watersheds

Model performance in terms of NSE between 2 watersheds

Histograms of the Nash-Sutcliffe

coefficient of efficiency for 30

calibration-validation combinations

(level 1 & 2 requirements)


Rimbaud

Rimbaud


Rimbaud1

Rimbaud


Fernow

Fernow


Fernow1

Fernow


Observed hydrologic changes at fernow

Observed hydrologic changes at Fernow


Fernow2

Fernow


Observed hydrologic changes at rimbaud

Observed hydrologic changes at Rimbaud

Both precipitation and streamflow have

significantly decreased over the 39 year period.


Rimbaud2

Rimbaud


Conclusions what we have learnt from this exercise

Conclusions (what we have learnt from this exercise)

  • Difference in model performance is small if calibration method is used consistently;

  • Source of non-stationarity is important;

  • Conceptual models tested are adequate in describing the effect of changes in precipitation, not the effect of changes in vegetation;

  • Changes to streamflow are greater than those in precipitation for these watersheds.


Conclusions what we have learnt from this exercise1

Conclusions ..(what we have learnt from this exercise)

  • The effect of the fire in the Rimbaud watershed is secondary in the context of the overwhelming decreasing trend in precipitation and streamflow over the 39 years;

  • The 2 conceptual models tested did not perform well for the Fernow (W6) watershed because of the significant increase in streamflow early in the study period, and the subsequent significant decrease in streamflow from 1986. And it snows a lot over there.


A comparative assessment of awbm and simhyd for forested watersheds

Thank You!


  • Login