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Geography_May_03_Markscheme_GeographyHSP2

Geography_May_03_Markscheme_GeographyHSP2 - INTERNATIONAL...

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MARKSCHEME May 2003 GEOGRAPHY Higher Level and Standard Level Paper 2 22 pages M03/320/HS(2)M+ INTERNATIONAL BACCALAUREATE BACCALAURÉAT INTERNATIONAL BACHILLERATO INTERNACIONAL c
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SECTION A A1. Drainage basins and their management (a) Essay [20 marks] An alluvial river “flows upon a thick accumulation of alluvial deposits constructed by the river itself in earlier stages of its activity”. Describe and account for the landforms associated with alluvial rivers and discuss the implications for land use. It would be expected that responses would describe and provide detailed explanations for the flood plain itself, with all its associated features such as meanders, scrolls, ox-bow lakes, levees, deltas and for the bluffs marking the edge of the valley. A variety of approaches could be adopted in response to the second part of the question, but it would be expected that all would show an awareness of the attraction of the flat plain with deep fertile soils and high water table for agriculture and also for residential and commercial buildings and transport links (ease of construction) and recreational purposes. However, any development would have to be weighed against the disadvantages arising from the constant danger of flooding, the unstable river courses, unconsolidated deposits and the additional costs arising from the implementation of flood preventative measures. The river bluffs could attract residential development as they offer scenic views of the valley, but such development could be hampered by the steep slopes. It would not be necessary that the marks be allocated equally between the two parts of the question – some adjustment would be possible. However, the key to this question is that it concerns a river only on its flood plain – only that part of any response that recognizes this should be marked. The marks should be allocated according to the markbands. – 2 – M03/320/HS(2)M+
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(b) Structured question [3 marks] (i) Define discharge and the describe the relationship between discharge and velocity shown in the diagram. Discharge should be defined in terms of the volume and velocity of water flowing past a point [1 mark] . There is a positive correlation between discharge and velocity, with the latter rising and falling as discharge increases and decreases [2 marks] . [6 marks] (ii) Draw a labelled flood hydrograph to represent the conditions shown in the diagram. The marks for the hydrograph should be allocated as follows: accuracy of diagram, showing a skewed hydrograph (steep rising limb, gentler falling limb) [2 marks] ; labelling (axes, peak, base flow) must be shown for [3 marks] . The final [1 mark] should be allocated for presentation. [4 marks] (iii) Identify the factors that could affect the length of the time lag in a flood hydrograph.
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