Presentation on theme: "HYDROSPHERE – OS MAPWORK"— Presentation transcript:
1HYDROSPHERE – OS MAPWORK Using an OS map, you should be able to describe the maincharacteristics of a river and its valleyThis question is not unlike the one you faced at S.G.You will be asked to describe the Physical features of a riverand perhaps its valley – do not mention bridges, settlement etc.Remember to give grid references – marks are given for this!
2HYDROSPHERE – OS MAPWORK Weak Answers:The river starts off straight, flowing N and then swings to the W,before going NE and then NW, NE again and then NW, N, NW andback NE and N. The river has a lot of meanders. It flows under abridge at and goes through woodland atWhat do you think of this answer?1. First sentence = 1 mark. General comment on direction is enough2. Gets two marks but could have got two for simply saying:‘The river meanders to the NW’3. Woodland and bridge references are irrelevant4. No grid reference given for meanders5. No mention of valley6. No mention of any other features
3HYDROSPHERE – OS MAPWORK Strong answer:The river meanders to the NW. An example of a meander is found atThe river is roughly the same width throughout the sectionand could be in its middle course. There are 2 tributaries withconfluence points at and There is an ox-bow lake atThere is an embankment at suggesting that the riveris prone to flooding here. The valley has a flood plain which widensfrom 500m wide in the South to 2km wide in the North. The East sideof the valley is gently sloping to over 30m whereas the West side issteep, rising to over 70m.What do you think of this answer?Can you draft up a list of questions you should be aiming toanswer?
4HYDROSPHERE – OS MAPWORK Can you draft up a list of questions you should be aiming toanswer?Physical Features of River:What course is the river in?STRAIGHT OR MEANDERING?DOES IT GET WIDER AS IT FLOWS DOWNSTREAM?DIRECTION OF FLOW?SPEED? GENTLE OR STEEP SLOPE?Features to note if present (give grid references)Braiding, embankments, oxbow lake, meanders, waterfallsTributariesHow many? From which direction do they come?
5HYDROSPHERE – OS MAPWORK Physical Features of Valley:Trend – E.g. North to South, East to West etc.Shape – U-shaped or V-shaped, gorge, steepness of valley sidesWidth – How wide is the valley floor? Can you measure?Features – flood plain, interlocking spursHeight – valley floor and valley sidesE.g. valley floor descends from 300m to 290mvalley sides rise from 100m to over 400m
6HYDROSPHERE – OS MAPWORK PAST PAPER QUESTION 2005Using appropriate grid references, describe the physicalcharacteristics of the River Bleng and its valley from(Stockdale Head) to (where it meets the River Irt).8 MARKSComplete in groupsTake 10 minutes to get down as much information as possibleSwap with another group – add to their answer (3mins)Swap again, look at the marking scheme grade the answer in front of you
7ANSWERS: PAST PAPER QUESTION 2007 The river Teme is in the lower section of its course betweenand Describe the physical characteristics of the river andits valley in this section.ANSWERS:Descriptions may include the following points:meanders, ox-bow lakes, tributaries, cut offs, small poolsbroad flat floodplain, alluvium, gently sloping valley sidesheight of land and easterly flow of river could also be creditedbraidingislands or eyots (806533)river terraces.Up to 1 mark for specific map evidence ie grid references ornames.(Maximum 1 mark for repeated references to same feature (eg Meander/ tributaries/confluences/direction of flow etc)
8CORE HIGHER GEOGRAHY TEXTBOOK Answer questions 1 4 on page 72Maps on page 73