4598

4326

كارشناسي ارشد

بيابانزدايي

اصفهان: دانشگاه صنعتي اصفهان ، دانشكده منابع طبيعي

1387

پانزده ، 130 ، [II] ص: مصور ، جدول ، نمودار

ص. ع. به: فارسي وانگليسي

سعيد سلطاني

فرزاد روحاني

88/5/13

سعيد اسلاميان ، افشين هنربخش

مهندسي منابع طبيعي

ID4326

به فارسي وانگليسي : قابل رويت در نسخه ديجيتال

Regional Frequency Analysis of low flow in Northern Karoon Watershed Maryam shamaeizadeh Sama7539@yahoo com 9 march 2009 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Saeid Soltani ssoltani@cc iut ac ir Abstract Drought is considered as shortage of precipitation comparing to average of it over a long time that would occur in any kinds of climates Recently years this phenomenon has changed to a critical problem and has caused great amount of damages Prediction of drought is the most important solution in contrast with drought In the last decades low flow frequency analysis has been considered as one of the methods for prediction of droughts Shortage of data especially in watersheds without hydrometric stations makes this task difficult to accomplish Regional analysis is using to reduce these problems Considering this fact that drought happens regionally and covers large areas and lasts long periods it is important to perform regional analysis This study was performed on northern Karoon watershed to predict hydrologic drought The data of 14 stations suitable for low flow studies with long enough duration was used Then 13 physiographic and climatic characteristics of chosen stations were selected Cluster analysis was used to perform homogeneity test for this region This analysis showed that by elimination of one station Barez station this region can be considered as a homogenous watershed Then seven day low flow time series were calculated for all the remaining stations Chi square and Kolmogorov smirnov best fit tests showed that the two parameter Gamma distribution is the best regional distribution for this region Therefore seven day low flow was estimated using HYFA for 2 5 10 20 50 and 100 years Then low flow regional analysis was performed using 3 methods of multiple regression low flow index method and distribution parameters regionalization To compare accuracy of these methods Root Mean Square error RMSE statistic was used Moreover flow duration curves were delineated to obtain Q95 index Then zoning maps for Q95 Q7 2 Q7 10 and Q7 100 were prepared pdfMachine Is a pdf writer that produces quality PDF files with ease Produce quality PDF files in seconds and preserve the integrity of your original documents Compatible across nearly all Windows platforms if you can print from a windows application you can use pdfMachine Get yours now

سعيد سلطاني

فرزاد روحاني

سعيد اسلاميان ، افشين هنربخش