The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
OPEN CHANNEL FLOW
1
2
3
Question
What is the most obvious difference between pipe flow and
open channel flow?
(in terms of flow conditions and energy situation)
Typical open channel shapes
Figure 14
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Q2.
A soil has a total (bulk) density of 1.91 Mg/m 3 and a water content of 9.5%. The value of
Gs is 2.7. Calculate the void ratio and degree of saturation of the soil. What would be the
values of den
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Homework #3
TA: LI Zhaofeng
Email: [email protected]
Stress path
Definition of p, p' and q
1
p a 2 r
3
1
p a 2 r
3
q a r u
Seepage
Head
u v2
h
Z
w 2 g
Total head
Pressure head (from the piezome
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Question 1. For the seepage situations shown in Fig. 3.9, determine the effective normal
stress on plane XX in each case. The saturated unite weight of the soil is 20 kN/m3.
(1) Take Plane XX as the r
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
LIFS1901 2014 Fall
EH2
DNA Replication, Cell
Division & Reproduction
Reference: Inquiry into Life, 14th ed.
Sections 5.15.5, 25.2
DNA Replication, Cell Division, Reproduction
1
Gain in cell number
Ce
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
LIFS1901 2014 Fall
EH4
Roster of living species
Reference: Inquiry into Life, 14th ed.
Chapters 2832
Microbes, plants & animals
(details not required)
1
Types of organisms
Based on
similarities &
di
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Q2.
A soil has a total (bulk) density of 1.91 Mg/m3 and a water content of 9.5%. The value of
Gs is 2.7. Calculate the void ratio and degree of saturation of the soil. What would be the
values of dens
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
5
HYDROLOGIC ROUTING
5.1
Chapter 5 Hydrologic Routing
HYDROGRAPH
Hydrograph is a continuous graph giving the information of the change of streamflow (Q) with
time (t)
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
Short Answers to Tutorials 5 to 8
Tutorial 5
Q.1
(a)
h (Q 1 + Q 3 Q 2)
=
t
D 2/ 4
.
(b)
V 2 =4.125 m / s .
Q.2
R x =1,765.8 kN
closed
R x =501,000 N =501 kN <
open
Rx
closed
Tutorial 6
Q.1
Hydraulic
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
Tutorial 10
Question 1
The flow rate in a long and straight trapezoidal channel is 80 m 3/s. The bottom width of the channel
is 15m, and the side slope is 1:1 (H:V). The channel bed slope is 0.0002. T
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
Chapter 7
7
Fundamental Laws of Hydraulics
7.1
Substantial Derivative in Fluid Mechanics
Fluid mechanics usually deal with properties that change in space and time. D
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
6
HYDROLOGIC DESIGN
6.1
Chapter 6 Hydrologic Design
HYDROLOGIC DESIGN SCALE
Hydrologic design is the process to assess the impact relating to hydrologic events on a w
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
Chapter 9
Chapter 9 Pumps and PumpPipe Systems
PUMPS AND PIPE SYSTEMS
Pump: A mechanical system that gives energy
Turbine: A mechanical system that extracts energy.
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
CIVL 3730 Fundamentals of Geotechnics
1
Topic IV: Stress and Strains in Soil
What will you learn?
Stressstrain relationships (Hookes law)(assuming
elastic behavior)
Calculate stresses and strains in
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Q1.
(i) Normal consolidated, located on the NCL:
N ln pc 2.6 0.14 ln 400 1.76
Undrained shear, void ratio at failure:
and
f
e f 1 0.76
Stress state at failure:
f
p f exp
M
2.45 1.76
exp
138
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Hummer/c 1" 6
Due. 40.14 i i *
Tibial cfw_1000' 
2.2 A deposit of soil is 16m deep and overlies an impermeable stratum:
the coefcient of permeability is 10"6 mls. A sheet pile wall is driven
to a dep
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
e,tL, 't. M"J, ,
Due date: Oct. l 28
Tutorial hour: Oct.
28
3H'" f. /1rtYw, ,
( ~,j"<t)
4.2' A series of drained triaxial tests was carried out on specimens of a
sand prepared at the same porosity and
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Homework #1
Due Date: Sep 23. Please submit your homework at the beginning of tutorial hour.
Tutorial hour: Sep 23 (Friday; for two sessions)
You only need to submit Q2 and Q3
Q1.
Please review the pa
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Q2.
A soil has a total (bulk) density of 1.91 Mg/m3 and a water content of 9.5%. The value of
Gs is 2.7. Calculate the void ratio and degree of saturation of the soil. What would be the
values of dens
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
4.2 Solution
Sand is cohesionless, and therefore c = 0; assuming pore water pressure uw = 0
because it is a drained test. Plot the Mohrcircle in the  space. When the Mohrcircle touches the failure e
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
1. Take Plane XX as the reference plane for elevation head.
Case (1):
Total head at Point A: HA = 5m
Total head at Point B: HB = 3m
HA HB Water flows from point A to B, downward seepage.
Hydraulic gra