International Rainwater Catchment Systems Association
International Rainwater Catchment Systems Conferences
  Next conference
  1st, Hawaii
  2nd, St Thomas
  3rd, Khon Kaen
  4th, Manila
  5th, Taiwan
  6th, Nairobi
  7th, Beijing
  8th, Tehran
  9th, Petrolina
  10th, Mannheim
  11th, Texcoco
  12th, New Delhi
  13th, Sydney
  14th, Kuala Lumpur
  Join IRCSA
  IRCSA Board

5th International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991

Section 4: Hydrological Data and Analysis

Page 190

Test Of Watershed Acidification Models Responses To Rainfall Intensity

Fi-John Chang
Department of Agricultural Engineering, National Taiwan University


Mathematical models are useful in improving our understand- ing of various processes and predicting the response in freshwater chemistry to changes in the deposition. A general weakness in models of the effects of acid deposition is that the models have not been tested sufficiently against observation. An alternative way to assess the applicability of models is to perform hypothesis test. Consequently, a hypothsis--increasing rainfall intensity will increase outflow hydrogen concentration--was tested with two well known watershed acidification models, the ILWAS and Birkenes models.

The ILWAS models confirms the hypothesis, while the Birkenes model does not produce the same conclusion. This is probably due to the simplicity of the hydrologic submodel of the Birkenes model and its assumption of constancy of the cation exchange capacity. The result of test the ILWAS model for the hypothsis show that it is a useful tool in the investigation of watershed acidification. This process-oriented model provides the essential insight to make predictive assessment of the effect of surface and subsurface water acidification under different loading.

PDF of full document (10pp, 240kb)

Note: The IRCSA proceedings section is still new and under active management, If you find any problems, ommissions or corrections please contact the administrator so we can put things right.
Top of Page