F4 Revision Exercise on river management

F4 Revision Exercise on river management

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2020 DSE

DBQ

Open Ended

(a) What is the fluvial feature shown on the map?

Open Ended

(b)(i) There is a need to manage the river channel at P because .......

[try to tell the reason and give map evidence to support your answer] [at least 2 marks]

Remember: Don't just focus on the impacts flooding may cause, but also why flooding may occur here.

Multiple Choice

(b)(ii) Identify the river management strategy at site P.

• carrying out channelization

• dredging

• building dykes

• placing gabions

• building bypass floodway

gabions

• protect river banks from erosion

• reduce silting

• increase water holding capacity

• straighten river channel

• increase river velocity

Multiple Choice

(b)(iii) Identify the river management strategy in photograph 2b.

• carrying out channelization

• dredging

• building dykes

• placing gabions

• building bypass floodway

Poll

(b)(iii) Do you think channelization is a more appropriate river management strategy to be adopted at site P?

• yes

• no

Open Ended

(b)(iii) With reference to the physical and human setting at P, channelization is (not) appropriate because ...

MCQ practice

Multiple Choice

2022 Q9

• A

• B

• C

• D

Multiple Choice

2018 Q16

• A

• B

• C

• D

Multiple Choice

2015 Q17

• A

• B

• C

• D

Multiple Choice

2013 Q16

• A

• B

• C

• D

Multiple Choice

2014 Q18

[The Three Gorges Project is a hard engineering measure which aims to reduce flooding in the lower course of Changjiang. A huge dam is built in the upper and middle course of the river and a huge reservoir is formed behind it.

There are several benefits brought by the project, e.g. generate HEP, attract tourism.]

• A

• B

• C

• D

Multiple Choice

2010 Q43

[The Three Gorges Project has improved the navigation along Changjiang. Large ships and vessels can now travel from the middle course to upper course of the river]

[However, the reservoir behind the dam traps sediments and prevents them from moving downstream, hence, the soil fertility at the lower course reduces. The construction of the dam has also brought many negative environmental and social impacts.]

• A

• B

• C

• D

Multiple Choice

2005 Q36

• A

• B

• C

• D

Multiple Choice

2016 Q14

[return farmland to lake 退耕還湖 is a soft strategy used along Changjiang, China]

[The aim of the strategy is to resume the size of lakes along the river. It is because when river enters a lake, velocity will reduce and deposition of loads will take place. Thus, the amount of loads that will be transported downstream can be reduced. This reduces the problem of silting in the lower course of river and reduces chances of floods.]

• A

• B

• C

• D

Multiple Choice

2010 Q24

[If water in the channel is diverted, meaning the discharge and energy will reduce. This cannot help to reduce silting.]

[straighten the channel can increase velocity and energy of river.]

[returning farmland to woodland means there will be more trees which can hold soil together. Woodland also encourages more infiltration and reduces surface runoff, thus less silting in the river]

• A

• B

• C

• D

Multiple Choice

2007 Q33

[Because of rapid development in China, a lot of lakes along Changjiang are reclaimed to provide more land for development. Thus, size of lakes reduces. (1) Some of these land are used for farming. So the area of farmland has increased. (4)]

[However, more trees are cut (2) to provide land for development. Deforestation is significant. Without trees to hold soil together, soil becomes loose and is washed into river easily through surface runoff. Hence, the amount of sediments in the river increases. (3)]

• A

• B

• C

• D

Multiple Choice

2007 Q31

[Lower course of Changjiang (which is located on eastern China) has a similar climatic conditions to HK]

[Rainfall is high in summer, but not throughout the year.]

[There is large amount of effluent discharged from cities, causing water pollution problem, not flooding.]

• A

• B

• C

• D

Multiple Choice

2005 Q37

[flood diversion scheme 南水北調 is a hard engineering strategy used in China to reduce flooding along Changjiang. By diverting the water, the discharge of Changjiang can be reduced.]

• A

• B

• C

• D

MCQs from Textbook

Multiple Choice

p.66 Q1

• A

• B

• C

• D

Multiple Choice

p.66 Q2

• A

• B

• C

• D

Multiple Choice

p.66 Q3

• A

• B

• C

• D

Multiple Choice

p.66 Q4. Which station is more likely to be located in the urban area?

• X

• Y

Multiple Choice

p.66 Q4a. Station X is more likely to be located in the urban area. It is because the rising limb of the hydrograph is ________________.

• steeper

• gentler

Multiple Choice

p.66 Q4bi. When will flooding occur?

• 0400

• 0500

• 0600

• 0700

• 0800

Multiple Choice

p.66 Q4bi. How long does it last?

• 4 hours

• 6 hours

• 8 hours

• 10 hours

• 12 hours

​2015 DSE Q2b(iii)

2015 DSE Q2b(iii)

The downstream of site 4 is favourable for the formation of depositional features because

1. the relief / gradient has become gentler. As shown on the map, the contour lines have become more widely spaced. With a gentle relief, the channel can swing more freely.

2. At the inner banks, river flow slower which favours deposition to take place. While at the outer banks, river flow faster favouring lateral erosion, Thus, as we can see from the map, meanders are formed..

3. There are also more tributaries joining the main river at the downstream of site 4, e.g. at site 7. These tributaries increase the amount of loads in the river.

Homework