Unsteady Drainage with Variable Drainage Porosity

Autor:	Rajendra K. Gupta, Ashim K. Bhattacharya, Pitam Chandra
Rok vydání:	1994
Předmět:	Groundwater flow Water flow Flow (psychology) Function (mathematics) Mechanics Agricultural and Biological Sciences (miscellaneous) Hydraulic head Geotechnical engineering Drainage Constant (mathematics) Porosity Water Science and Technology Civil and Structural Engineering Mathematics
Zdroj:	Journal of Irrigation and Drainage Engineering. 120:703-715
ISSN:	1943-4774 0733-9437
DOI:	10.1061/(asce)0733-9437(1994)120:4(703)
Popis:	Presently available solutions of the one‐dimensional unsteady‐state ground‐water flow equation (Boussinesq equation) have been obtained by treating the drainable porosity f as a constant. Experimental evidence however, indicates that f is a function of hydraulic head h. An experimentally determined f‐h relationship was incorporated in the Boussinesq equation. The equation was solved by using the extrapolated Crank‐Nicholson's difference scheme for predicting the spatial and temporal water‐table behavior. The predicted hydraulic heads were compared with the other available solutions of the Boussinesq equation obtained by treating f as a constant and with the observed data in two different sand tank model studies. The average absolute deviation between the predicted and the observed water‐table depths was reduced by over 70% when the present approach was used as compared to when f was treated as a constant.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0f83aefe75e3433bcfeda7adea2fe1aa https://doi.org/10.1061/(asce)0733-9437(1994)120:4(703) Zobrazit plný text záznamu