Geography HL+SL paper 2

Geography HL SL - c IB DIPLOMA PROGRAMME PROGRAMME DU DIPLME DU BI PROGRAMA DEL DIPLOMA DEL BI N07/3/GEOGR/BP2/ENG/TZ0/XX/M MARKSCHEME November

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c IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI N07/3/GEOGR/BP2/ENG/TZ0/XX/M+ MARKSCHEME November 2007 GEOGRAPHY Higher Level and Standard Level Paper 2 24 pages
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- 2 - N07/3/GEOGR/BP2/ENG/TZ0/XX/M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IBCA.
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- 3 - N07/3/GEOGR/BP2/ENG/TZ0/XX/M+ SECTION A A1. Drainage basins and their management Either (a) Essay Analyse the natural and human factors that affect the movement of water in river channels. [20 marks] Answers should identify the following with regard to movement of water within the channel: type of flow (turbulent or laminar), speed of flow (velocity) and variations within the channel (velocity vectors). Answers could refer to the following variables as natural factors: roughness of the bed and banks (friction), the gradient of the channel, the shape of the channel in cross section (including hydraulic radius), the discharge. The local geology or rejuvenation factors are also acceptable. All of the above are not essential to a markband F answer. Answers should analyse the effect of these on the movement of water in the channel and may refer to specific landforms in order to illustrate the effects of these variables, such as a section across a meander, the variations caused by riffles and pools or variations in bedrock resistance. Very good answers (markband F) may show an understanding of the interrelationship of discharge, area of cross section and velocity (Q = A × V), especially in terms of the effects of changes in discharge on the speed and flow of water in the channel. Answers should also analyse the ways in which people can change these variables by altering the course, gradient, shape, discharge and roughness of river channels. Marks should be awarded according to the markbands. Answers that refer to both natural and human factors are likely to be credited at markband D and above. Answers that offer explicit analysis of how factors affect the movement of water in the channel are likely to be credited at markbands E/F.
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- 4 - N07/3/GEOGR/BP2/ENG/TZ0/XX/M+ Or (b) Structured question (i) Define the term discharge . [2 marks] Discharge should be defined as the volume of water passing a given point [2 marks] on a river (measured in 3 m/sec .) Part in brackets is not essential. (ii) Comment on the relationship between the discharge and the recurrence interval shown in the diagram. [4 marks] Answers should state that the larger the discharge, the greater the recurrence interval [1 mark] , (or conversely, the smaller the discharge, the shorter the recurrence interval). There are therefore fewer floods with a high discharge and more with a smaller discharge [1 mark] . The other [2 marks] should be awarded for relevant quantification that supports these statements. (iii) Explain how the information shown in the diagram helps in
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This note was uploaded on 06/22/2010 for the course COMCC 05123 taught by Professor Mcgee during the Spring '10 term at York County CC.

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Geography HL SL - c IB DIPLOMA PROGRAMME PROGRAMME DU DIPLME DU BI PROGRAMA DEL DIPLOMA DEL BI N07/3/GEOGR/BP2/ENG/TZ0/XX/M MARKSCHEME November

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