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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Trend analysis of climatic variables and their impact on stream flow using nam model
Trend analysis of climatic variables and their impact on stream flow using nam model
Author : V. D. LOLIYANA(1) & P. L. PATEL(2)
ABSTRACT
Significant changes observed in the behaviour of climatic variables over a period of time, has triggered unexpected variations
in the stream flow pattern in many catchments across the globe. In present study, 30 years (1975-2004) rainfall, potential
evapotranspiration (PET), temperature and stream flow data are analyzed for Gopalkheda sub-catchment in upper Tapi
basin, India. The sub-catchment spreads over an area of 7225 km2, and incorporates nine raingauge stations, two weather
stations and one stream gauging site. The change in the climatic variables of aforesaid sub-catchment is examined using
non-parametric Mann-Kendall (MK) and SenĄ¯s slope estimator test. The available data were checked for effect of serial
correlation and normality using Chi-square and Kolmogorov-Smirnov tests before applying MK test. The percentange
increase in annual average PET and temperature have been found to be 32% and 1.11% respectively in the study period.
On other hand, the rainfall and stream discharge patterns have shown a decreasing trend with magnitude 23% and 31%
respectively over the period. Further, a lumped conceptual hydrological model, NAM (MIKE11), calibrated from 27 years
data (1978-2004) is used for assessing the hydrologic processes in the sub-catchment. The calibrated model has been able
to simulate the peak events satisfactorily. The NAM model parameters are also estimated for the three splitted time periods
(1978-1986, 1987-1995, 1996-2004) vis-¨¤-vis total period (1978-2004) to ascertain the possible changes in the parameters
due to changes in the climate variables and land use/ land cover in the study area.
File Size : 796,612 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 20/08/2015
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