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Hydrologic Systems and Flow Analysis

The document describes three hydrologic systems: 1) A drainage area system with inputs of rainfall, outputs of runoff, and a working medium of water and soil. 2) An evapotranspiration system in the hydrologic cycle with inputs of rainfall on vegetation, outputs of evaporation and transpiration from plants, and a working medium of water, plants, and air. 3) An infiltration system with inputs of rainfall, outputs of infiltration into soil pores, and a working medium of water and soil.

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Nadia Karima
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709 views4 pages

Hydrologic Systems and Flow Analysis

The document describes three hydrologic systems: 1) A drainage area system with inputs of rainfall, outputs of runoff, and a working medium of water and soil. 2) An evapotranspiration system in the hydrologic cycle with inputs of rainfall on vegetation, outputs of evaporation and transpiration from plants, and a working medium of water, plants, and air. 3) An infiltration system with inputs of rainfall, outputs of infiltration into soil pores, and a working medium of water and soil.

Uploaded by

Nadia Karima
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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You are on page 1/ 4

Nadia Karima Izzaty

1306369466
Dept. Teknik Sipil

1.2.1. Take three hydrologic systems with which you are familiar. For each, draw the
system boundary and identify the inputs, outputs, and working media.

a. Sistem aliran air di dalam sebuah DTA

Boundary: daerah tangkapan air


Input: air hujan yang turun di DTA
Output: aliran air limpasan
Working media: air dan tanah
b. Sistem evapotranspirasi dalam siklus hidrologi

Boundary: daerah tangkapan air, terutama di daerah vegetasi


Input: air hujan yang turun di daerah vegetasi tersebut

Output: uap air yang mengalami evaporasi dan transpirasi dari tumbuhan
Working media: air, tumbuhan, udara
c. Infiltrasi air hujan ke dalam tanah

Boundary: tanah dasar


Input: air hujan yang turun hasil presipitasi
Output: resapan air yang terinfiltrasi ke dalam pori-pori lapisan tanah
Working media: air, tanah

1.3.1. The equation k(dQ/dt) + Q(i) = I(t) has been used to describe the gradual
depletion of flow in a river during a rainless period. In this case, I(t) = 0 and Q(t) = Q 0
for t = 0. Solve the differential equation for Q(i) for t > 0 and plot the result over a 20day period if k = 10 days and Q0= 100 cfs.
k

dQ
+Q t =I t
dt

Qt =100 cfs; k=10 days


10.

dQ
+100=0
dt

dQ 100
=
=10
dt
10
dQ

dt =10 dt
Q(t )=10 t+ c1

c 1 adalah konstanta integralterbuka

Grafik Q vs t
0

10

15

20

25

-50
-100
-150
-200
-250

1.4.1. Classify the following hydrologic phenomena according to the structure given in
Fig. 1.4.1: (a) steady, uniform flow in an open channel; (b) a sequence of daily average
flows at a stream-gaging site; (c) the annual maximum values of daily flow at a site; (d)
the longitudinal profile of water surface elevation for steady flow in a stream channel
upstream of a bridge; (e) the same as (d) but with a flood passing down the channel; (J)
a sequence of annual precipitation values at a site; (g) a sequence of annual
precipitation values at a group of nearby locations.

Steady, uniform flow in an open channel: deterministic, lumped, steady flow

A sequence of daily average flows at a stream-gaging site: deterministic, lumped,

unsteady-flow
The annual maximum values of daily flow at a site: deterministic, lumped,

unsteady-flow
The longitudinal profile of water surface elevation for steady flow in a stream

channel upstream of a bridge: stochastic, space-correlated, time-independent


Same as above, but with flood passing down the channel: stochastic, space-

independent, time-independent
A sequence of annual precipitation values at a site: stochastic, space-independent,

time-correlated
A sequence of annual precipitation values at a group of nearby locations:
stochastic, space-correlated, time-independent

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