NYJC Prelim_H2_GEO_9751_P2

NANYANG JUNIOR COLLEGE Year 2 Preliminary Examination H2 GEOGRAPHY 9751/02 Paper 2 Data Response Questions 20 September 2018 3 hours Additional Materials: Answer Paper 1 Insert World outline map READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name on the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Candidates answer all questions. The Insert contains all the Resources referred to in the questions. You should make reference to appropriate examples studied in the field or the classroom, even where such examples are not specifically requested by the questions. Diagrams and sketch maps should be drawn whenever they serve to illustrate an answer. The world outline map may be annotated and handed in with relevant answers. You are reminded of the need for good English and clear presentation in your answers. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 6 printed pages. [Turn over

2 Higher 2 Geography / 9751 / 02 Section A Theme 4 – Geographical Investigation 1. A group of geography students went to st udy the Stung Chrey Bak Stream in Cambodia as part of their overseas geographical investigation project. The stream is a tribut ary which feeds the Tonle Sap River. The team wanted to investigate the impact of landuse changes on flood risk and liveability of the area. Data collection on stream velocity, dept h, wetted perimeter and cross-sectional area was done over two days in December during the dry season. The team first measured a segment of the upstream bef ore repeating the same process for a segment downstream. Due to time constr aints, only one m easurement (at 10am for both days) was taken for each stream segment. Equipment used: • ball of twine • meter ruler • measuring tape • portable flow meter to m easure stream velocity The team measured the river velocity at regular intervals using a portable flow meter at depths of 0.2% and 0.8% from the water surface. Flow meter used to measure velocity http://www.cleo.net.uk/consultants_resources/geography/source2sea/Sor2Sea/CURRENT.HTM After measuring velocity, the team then laid an unweig hted measuring tape along the river bed to measur e the wetted perimeter. T here were some boulders on the channel bed for the upper segment of the stream. Depth measurements were also taken at equal distances across the river. The data is used to plot the stream’s wetted perimeter and to calculate the cross sectional area.

3 Higher 2 Geography / 9751 / 02 Cross-sectional area of the upstream segment of Stung Ch