TITLE:
Mapping of Stream Flow Trends in Porsuk Basin Using GIS Environment
AUTHORS:
Yıldırım Bayazıt, Recep Bakış, Cengiz Koç
KEYWORDS:
Flow Gauging Station (FGS), Porsuk Basin, Mann-Kendall, Trend Analysis, Geographical Information Systems (GIS)
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.9,
September
19,
2019
ABSTRACT: In this study, trends of minimum, average and maximum flows were investigated in Porsuk basin, which is a sub-basin of Sakarya basin and then changes in flows were mapped using Geographical Information Systems (GIS). In the study, in 10 flow gauging stations across the Porsuk basin, monthly average, maximum and minimum flow data is used covering the period 1961-2013 (53 years). When analyzing the distribution of observed trends in the basin, a trend has been observed in most of the river flows. A decreasing trend has been observed overall in the basin. Trends are generally decreasing over time except for a few stations. As a result, increasing trends are observed in the west part of the basin; while in the east part of the basin decreasing trends are observed. When average and maximum monthly flows are investigated, decreasing trends are observed in the stations except DSI-12182. Trend analysis of 10 flow gauging stations across the Porsuk basin is investigated by Mann-Kendall method. Trend distribution was made according to flow trends of basin by transferring Z values to GIS.