Recap Rivers

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					       Recap Rivers
Rivers work hard. They are always E________ and
moving this material downstream (T __________).
Rivers are eroding down the way and across the way.
This makes the river D_________ and W_________ .
One place along the river where erosion is obvious is at
the features called W_____________ .
Waterfalls are _________ (write a definition of
waterfalls using your notes) ______________ .
 Waterfall
and Gorge 1
(OBLIQUE AERIAL VIEW)




      EROSION
 TYPE: Vertical
 and Headward
 Waterfall
and Gorge 2
(PROFILE VIEW)



     EROSION
TYPE: Vertical
and Headward
Also known as the ‘Mature’ stage
                                         Meanders 1
                                                (Aerial View)

                                   Meanders     are   formed
                                   because     the    current
                                   swings to the outside of a
                                   bend and concentrates
                                   the     erosion     there.
                                   Deposition occurs on the
                                   inside of the bed where
                                   there is not enough
                                   energy to carry load.
                                   EROSION TYPE: Lateral
                                                   Meanders 2
                                                   (Profile View / Cross
                                                           Section X - Y)



                                                      EROSION
                                                   TYPE: Lateral

This cross section clearly shows the eddy current (near ’X’) formed by
the velocity of the river being concentrated on the outside of the bend.
These UNDERCUT the bank causing the formation of a RIVER CLIFF. On
the inside (NEAR ‘Y’), a SLIP-OFF-SLOPE is formed where current is too
slow to carry any load.
                            Ox-Bow Lake 1
                                     (Aerial View)


                        Ox-bow lakes are formed
                        when     two    meander
                        RIVER CLIFFS are being
                        eroded    towards   each
                        other.     These     will
                        eventually meet, causing
                        the river to then flow
                        across the bottom of the
                        diagram.
EROSION TYPE: Lateral
Ox-Bow Lake 2   (Aerial View)
Can you work out what the river is trying to do by using this diagram?

				
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posted:8/31/2012
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