Lecturer:
Gabriella Petaccia
Course name: Idrologia (mn)
Course code: 062101
Degree course: Ingegneria per l'Ambiente e il Territorio
Disciplinary field of science: ICAR/02
The course relates to:
University credits: CFU 6
Course website: n.d.
Specific course objectives
The courses focuses in giving the student the necessary knowledge to cope with hydrologic problems that commonly arise in engineering such as: water supply, flood analysis. It gives also the statistic notions necessary to design works for an assigned risk level. Each lesson lasts 2 hours.
Course programme
Rainfalls
Origin and classification of rainfalls. Thunderstorms, hurricanes. The pluviometric regime, and the italian regimes.
Measurement of Rainfall
Rain gauges, sources of rainfall data. Space-Time characteristics of Rainfall, Interpolation of rainfall records ( Thiessen diagrams, Isohyetal maps)
Statistical and probability analysis of hydrological data
Statistical variables, random variables, frequency, probability and statistical distributions
The drainage basin:
Definition and main features, time of concentration
Statistical and probability analysis of hydrological data
Statistical distributions and parameters. Return period. Binomial distribution.
The hydrologic losses
Evaporation, measurement of evaporation, real and potential evaporation. Infiltration
Continuous random variable probability distributions
Normal distribution, Gamma distribution, Poisson distribution, Pearson distribution, Extremal distribution, Lognormal distribution.
Determination of runoff from precipitation
Runoff coefficient, SCS method, Curve number.
Choice of the probability distribution
Probability paper, plotting of data, curve fitting, reliability of analysis, Statistical Inference
Stream flow measurements
Determination of stage: Stage indicators . Velocity measurements: the rotating meter. Discharge measurements. The hydrometric station, stage discharge relation.
Statistical tests.
Introduction, Pearson Test.
Flood characteristics and determination, statistical analysis
Flood hydrograph analysis. Statistical local analysis, relation between maximum yearly peak discharges and average daily discharge.
Quantitative determination of urban storm water runoff
Depth duration curve, the hydrograph method: IDF, Chicago, Sifalda and ISWS methods
Rainfall-Runoff modelling.
Rational method, Linear and stationary systems. Instantaneous unit hydrograph, conceptual methods, Linear reservoir, linear channel, series and parallel of linear systems, Nash’s model
practical classes
exercise 1
Statistical bases: Return period, Cumulative probability.
Exercise 2
Drainage basin, Hypsometric analysis, average height, concentration time, average slope, Horton constants:
Exercise 3
The hydrologic losses
Exercise 4
Discharge evaluation
Exercise 5
Evaluation of a discharge for assigned return period
Exercise 6
Depth duration curve evaluation
Exercise. 7
Pearson Statistical Test
Exercise.8
Design hydrograph method
Exercise.9
Instantaneous unit hydrograph: linear reservoir and linear channel
Exercise. 10
Instantaneous unit hydrograph GIUH
Exercise 11
rainfall runoff analysis: series and parallel of linear systems
Course entry requirements
Course structure and teaching
Lectures (hours/year in lecture theatre): 32
Practical class (hours/year in lecture theatre): 27
Practicals / Workshops (hours/year in lecture theatre): 0
Project work (hours/year in lecture theatre): 0
Suggested reading materials
Chow, V.T.; Maidment, D.R.; Mays L.. Applied Hydrology,. WNew York, Mc Graw-Hill Book Company, 1988..
Maione, U.; Moisello, U.:. Elementi di statistica per l. Pavia, la Goliardica Pavese, 1993..
Moisello, U.. Idrologia tecnica. Pavia, La Goliardica Pavese, 1998..
Testing and exams
THE EXAM WILL TAKE PLACE USING PERSONAL COMPUTERS
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