The effect of land use schematization on result of surface runoff modeling with the example of Miljakovac catchments

Abstract

Experimental catchments Miljakovac has been used in 1980-es for field studies of rainfall-runoff processes. The most accurate analysis of flow in storm sewer systems can be achieved when there is a land use map defined in details, with every single building, but that requires a lot of time for preparation of data. Standard designing procedure uses maps with zones of similar levels of urbanization. Usually, there are no data of measured rainfall and outflow events available, so the created model can be calibrated. Paper presents, that if data of measured flows are available with calibration of percentages of different surface types (roofs, other impervious and pervious areas) in each zone, difference between simulated and measured flow can be brought to minimum. There are two groups of data about urbanization growth, assumed and exact state. This paper analyses error that is made in assumed state, and influence of more and less detailed terrain model on flow from whole catchments, also on flow in single pipes.

Eksperimentalni sliv Miljakovac je korišćen za ispitivanje procesa padavine oticaj tokom 1980-tih godina. Detaljna podela namene površina je najbolji način pripreme podataka, u analizi simulacionog modela tečenja u sistemima kišne kanalizacije, ali zahteva dosta vremena. U standardnoj projektantskoj praksi se najčešće pristupa izradi grubog" modela namene površina, gde se površina sliva deli u zone sa sličnim nivoom urbanizacije, ali obično ne postoje podaci o izmerenim oticajima, tako da nije moguće kalibrisati takav grubi model. U radu je pokazano da se kalibracijom procenata pripadajućih površina za svaku zonu, kada postoje podaci o izmerenim oticajima, dobija zadovoljavajuće slaganje maksimalnog simuliranog i izmerenog oticaja. Takođe se analizira greška koja se javlja u pretpostavljenom stanju novoizgrađenih objekata, njen uticaj, i uticaj detaljnosti konfiguracije terena, na oticaj na izlazu iz sliva i u izdvojenim cevima.