Assessment of retention potential changes as an element of suburba nization monitoring on example of an ungauged catchment in Poznań Metropolitan Area (Poland)
Wydział Inżynierii Środowiska i Gospodarki Przestrzennej (Uniwersytet Przyrodniczy w Poznaniu)
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Rocznik Ochrona Srodowiska
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(liczba autorów: 1)
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potencjał retencyjny
Poznański Obszar Metropolitalny
monitoring suburbanizacji
metoda SCS-CN
zlewnie niekontrolowane
gospodarowanie wodą
The development of the cities results in significant changes in land use and functional connections between urban and rural areas. The changing relations etween he use of urban and rural areas lead to changes in the quality of the inhabitants’ lives, of the environment and ecosystem services, including water resources. Those changes are the most visible in peri-urban areas. Different scenarios of the development of urbanized areas in Europe based on the IPCC assumptions indicate their further expansion at 0,4-0,7% per year which is over 10 times higher score than any other land use. This means that the intensity of this process will be particularly visible in peri-urban areas, including considerable areas of Poland. The observed intensive transformations of arable lands into built-up and urbanized areas make one think about the influence of suburbanization on water management, especially in the context of extreme phenomena, out of which the most afflictive over the two last decades were floods in 1997, 2011 and 2010. Monitoring the process of suburbanization gains importance in the context of its influence on water management in the river catchment which, according to the IWRM principle, a basic planning unit are in water management planning. The objective of this paper was evaluation of the possibility of using the SCS-CN method as an element of monitoring process of suburbanization through sizing the changes in the in water retention potential of ungauged catchments on peri-urban areas of metropolitan areas. Detailed analyses were carried out based on the Skorzynka river catchment located within the rural communes of Dopiewo, Tarnowo Podgórne and the city of Poznań which are the nucleus of Poznan Metropolitan Area (PMA) (currently defined as the voivodeship urban functional area of Poznań). Altogether, according to the delimitation proposed by the regional planning office Wielkopolskie Biuro Planowania Przestrzennego (WBPP), PMA comprises 45 communes together with Poznań(including 10 cities – centres of district and 15 other small cities). To the assessment of potential water retention and effective precipitation the SCS-CN method was used. The changes in land use were estimated on the basis of a topographic map from 1998 at a 1:10 000 scale and the Urban Atlas based on satellite photographs from SPOT 5 satellite on the ground resolution of 2.5 m from 2007. Data on soil were obtained from soil and agricultural maps at a 1:25 000 scale performed by Institute of Soil Science and Plant Cultivation (IUNG) in Puławy. All analyses were performed using ArcGIS 10.0 software by ESRI. The information about precipitation based on the data from the climatic station of Poznań Ławica. Thanks to using the SCS-CN method a 20% decrease of potential water retention (99 to 80mm) in the 11-years period for Skórzynka catchment in average antecedent moisture conditions (AMC II) has been demonstrated. Also, a 17% increase of effective precipitation (35 to 41 mm) calculated for extreme rainfall event observed on 17/08/2010 was shown. The conducted analyses allow to conclude that the SCS-CN method is a useful and desirable tool used to monitor the process of suburbanization in ungauged catchments located within etropolitan areas in order to assess the changes of potential water retention. The obtained data may be a decision criterion for local authorities in the proper creation of spatial policy, especially in the sphere of water resources management and preventing local floods and droughts.
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