Analysis and Development of Conceptual Rainfall-Runoff Model Structures for Regionalisation Purposes  

Oleh:

Hyosang, Lee ; Young-Il, Moon

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: KSCE Journal of Civil Engineering vol. 11 no. 1 (2007), page 57-64.
Topik: Rainfall-Runoff Model; Parameter Identifiablity

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: KK25.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This paper attempts to investigate, in detail, the behaviour of the selected conceptual rainfall runoff model structures (a Penman-based model and a probability distribution-based model) by using a novel method of dynamic parameter identifiability analysis (DYNIA). Two UK catchments were used as case studies. This paper shows that potential weaknesses of model structures are uncovered by this analysis: a) the optimum parameter shifts over the time domain, and b) insensitive model parameters shift over the wet period and dr period. However, attempting to interpret these results, and use them as a basis for improving the model structure proved difficult. The dynamic relationships between the model parameter and the variable soil moisture state in the model have been considered based on these analyses. Possible model modifications have been suggested: a) Making the proportion of rainfall that bypasses the soil stores responsive to soil wetness, rather than a constant, and b) Directing this bypassed rainfall to the fast routing reservoirs rather than splitting it between fast and slow reservoirs. However, substantial and well-founded changes in the model structures had marginal effect on the time-series output. The lack of improved pertbrmance raises a number of questions and points the way forward for more research. The results may suggest that improvement of the model performance depends more on the quality of data (or catchment information) rather than the hydrological representation of the different catchments.

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