Investigation of hydrological drought using Master Recession Curve (MRC) analysis in hydrometric stations‌ of Ardabil province

Parchami Yajello, Nahideh (2020) Investigation of hydrological drought using Master Recession Curve (MRC) analysis in hydrometric stations‌ of Ardabil province. Masters thesis, University of Mohaghegh Ardabili.

Text Parchami Thesis.pdf Download (605kB)

Abstract

Research Aim: The purpose of this study was to investigate hydrological drought using MRC analysis in Ardabil rivers. Research method:. Research Methodology: In the present study, VB software was used to analysis the temporal changes in the behavior of the recession curve. The VB software performs the analysis and analysis of the recession coefficients and uses 6 regression equations to derive master recession curve. For the present study, daily discharge data of the studied stations were prepared and entered into VB software after preparation. After determining the recession curves for different periods of each major recession curve station, the main recession curve coefficients (slope and constant value) were determined. Using Pro‌Ucl software, the trend of subtraction coefficients for the statistical period was calculated at the stations under study. To determine the trend, both linear regression and mankendall regression methods were used in ProUcl software environment. In addition, the streamflow drought index (SDI) was used to evaluate hydrological drought at 28 hydrometric stations in Ardabil province. The SDI was calculated using DrinC software and then the hydrological drought characteristics were analyzed and the spatial variability of SDI in GIS software was determined. Findings: According to the results, Master Recession Curve in the study of slope coefficient trend at stations of Polealmas, Aladezgeh, Deroo, Nanakran, Shamsabad, Sola, Dostbeglo, Samian, Kozetopraghi, Nir, Gilandeh, Mashiran and Boran have a significant increase at 1 % Level. These stations have large area and more discharge. While Iril,, Amogin and Abgarm stations at the 5% level there are an upward ternd. In the trend analysis of contants coefficient stationary stations of Polealmas, Iril, Aladezgah, Deroo, Nanakaran, Villadegh, Shamsabad, Sola, Dostbeglo, Samian, Kozatoparaghi, Nir, Gilandeh, Boran and Mashiran, there are signification decreasing trend value at the 1% level. In the study of hydrological drought mile drought at SDI1 month, 3month , 6 month and annual scales, at most stations is estibilshed. Conclusion: Hydrological drought using study Hydrological indices at study stations there is a master recession curve indication yhe statas of the water cources but at a broader leved it is not applicable for hydrological drought assessment.

Actions (login required)

View Item