We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
REGIONAL FREQUENCY ANALYSIS OF LOW FLOWS USING L.MOMENTS FOR INDUS BASIN, IN PAKISTAN.
- Authors
Ahmad, I.; Yasin, M.; Fawad, M.; Saghir, A.
- Abstract
The regional frequency analysis (RFA) for 10 days low flow series was conducted on 09 sites of Indus basin by using method of linear moments (L-Moments). Out of nine sites, one site was found to be discordant on the basis of discordant measure Di. The remaining eight sites formed two homogenous regions, each of the regions i.e. Region-I and Region-II consisted of four sites. Best distribution was selected on the basis of L-Moments ratio diagram (LMRD) and goodness-of-fit criterion Zdist. Generalized Normal (GNO) was found to be the most appropriate probability distribution for Region-I while GPA for Region-II. The low flow quantiles of regional frequency distribution (growth curves) were estimated for different return periods and accuracy of these estimates were assessed under Relative Root Mean Square Error (RRMSE), Absolute Bias (AB), Relative Absolute Bias (RAB) together with Lower Error Bound (LEB) and Upper Error Bounds (UEB). For Region II, RRMSE of GPA distribution was smaller for shorter return periods of 2, 5, 10 and 20 years and was higher for larger return periods of 50, 100, 500 and 1000 years. The lower and upper error bounds were narrow at low return periods as compared to error bounds for larger return periods. This regional study showed that there was a good agreement in general between observed and simulated low flows by regional frequency distribution and the results would be suitable for practical applications.
- Subjects
FREQUENCIES of oscillating systems; GEOLOGICAL basins; L-moments; LINEAR momentum; DISTRIBUTION (Probability theory); GROWTH curves (Statistics); STANDARD deviations
- Publication
Pakistan Journal of Science, 2017, Vol 69, Issue 1, p75
- ISSN
0030-9877
- Publication type
Article