XI WORLD FORESTRY CONGRESS

Antalya, Turkey, 13 to 22 October 1997


VOLUME 2, TOPIC 9


    EFFECTS OF CLIMATE AND PHSIOGRAPHIC FACTORS ON FLOODING AT WATERSHED OF TRABZON-MADEN CREEK

    Arslan Okatan1, Mahmut Reis2, Alaaddin Yüksel 3

    In this study, factors affecting flooding in the Trabzon-Maden Creek Watershed were investigated. Soil samples from different aspects, altitude and land management classes were taken according to Factorial Design to determine hydrological, physical and chemical properties of soil, and to understand the sources of soil loss with flooding. Relationships between some soil properties and climate-physiographic factors are discussed.

    1 Assistant Professor, Karadeniz Technical University, Faculty of Forestry 61080 Trabzon, Turkey. E-mail: sgumus@osf03.bim.ktu.edu.tr

    2 Forest Engineer, Karadeniz Technical University.

    3 Research Assistant, Sütçü Imam University, Faculty of Forestry, K.Maras, Turkey.

    AN INVESTIGATION ON THE CAUSE AND RESULTS OF FLOOD DISASTER WHICH OCCURED IN MELYAT CREEK WATERSHED NEAR RIZE-PAZAR

    Arslan Okatan1, Mahmut Reis 2

    In this study, the cause and effects of the flood disaster that occured in the Melyat Creek watershed after 2 hours of heavy rain in August 1995 were studied. Melyat Creek watershed is located in the East Black Sea region, 30 km far from Rize.

    For this purpose, samples of soil were taken from research plots chosen from forest lands and tea lands (Camellia sinensis (L) O. Kuntze) in order to determine flood damage that occurred in the Melyat river basin. Soil profiles were dug according to "Factorial Trial Design", and a sufficient number of degraded natural samples of soil structure were taken from different depth (0-30 and 20-50 cm). These soil samples were evaluated and the same physical, chemical and hydrological soil properties were determined to obtain the causes of soil loss which occurred as a result of the flood. On the soil samples, the differences between erodibility index values were determined. The results of the analysis showed that: general average erodibility index values of soils in the study area were found to be greater than the suggested limit values. That is why the watershed soils are susceptible to erosion as the relation between the overflow and plant cover were explained.
    These results related with the soil properties because of the damages resulting from the conversion of forest areas to the agricultural areas, especially in the structure of the surface soil, there has been a change that increases erosion.

    Keywords: Flood, erodibility, watershed, soil properties, agriculture.

    1 Assistant Professor, Blacksea Technical University, Faculty of Forestry, 61080 Trabzon, Turkey. E-mail: sgumus@osf03.bim.ktu.edu.tr

    2 Forest Engineer, Blacksea Technical University.



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