Presentation on theme: "HYDROSPHERE – OS MAPWORK Using an OS map, you should be able to describe the main characteristics of a river and its valley This question is not unlike."— Presentation transcript:
HYDROSPHERE – OS MAPWORK Using an OS map, you should be able to describe the main characteristics of a river and its valley This question is not unlike the one you faced at S.G. You will be asked to describe the Physical features of a river and perhaps its valley – do not mention bridges, settlement etc. Remember to give grid references – marks are given for this!
HYDROSPHERE – 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 and back NE and N. The river has a lot of meanders. It flows under a bridge at 587028 and goes through woodland at 580050. What do you think of this answer? 1. First sentence = 1 mark. General comment on direction is enough 2. Gets two marks but could have got two for simply saying: –The river meanders to the NW 3. Woodland and bridge references are irrelevant 4. No grid reference given for meanders 5. No mention of valley 6. No mention of any other features
HYDROSPHERE – OS MAPWORK Strong answer: The river meanders to the NW. An example of a meander is found at 587028. The river is roughly the same width throughout the section and could be in its middle course. There are 2 tributaries with confluence points at 588036 and 584040. There is an ox-bow lake at 585044. There is an embankment at 587038 suggesting that the river is prone to flooding here. The valley has a flood plain which widens from 500m wide in the South to 2km wide in the North. The East side of the valley is gently sloping to over 30m whereas the West side is steep, rising to over 70m. What do you think of this answer? Can you draft up a list of questions you should be aiming to answer?
HYDROSPHERE – OS MAPWORK Can you draft up a list of questions you should be aiming to answer? 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, waterfalls Tributaries –How many? From which direction do they come?
HYDROSPHERE – 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 sides Width – How wide is the valley floor? Can you measure? Features – flood plain, interlocking spurs Height – valley floor and valley sides E.g. valley floor descends from 300m to 290m valley sides rise from 100m to over 400m
HYDROSPHERE – OS MAPWORK PAST PAPER QUESTION 2005 Using appropriate grid references, describe the physical characteristics of the River Bleng and its valley from 136095 (Stockdale Head) to 102032 (where it meets the River Irt). 8 MARKS 1.Complete in groups 2.Take 10 minutes to get down as much information as possible 3.Swap with another group – add to their answer (3mins) 4.Swap again, look at the marking scheme grade the answer in front of you
PAST PAPER QUESTION 2007 The river Teme is in the lower section of its course between 760545 and 850522. Describe the physical characteristics of the river and its valley in this section. ANSWERS: Descriptions may include the following points: meanders, ox-bow lakes, tributaries, cut offs, small pools broad flat floodplain, alluvium, gently sloping valley sides height of land and easterly flow of river could also be credited braiding islands or eyots (806533) river terraces. Up to 1 mark for specific map evidence ie grid references or names. (Maximum 1 mark for repeated references to same feature (eg Meander/ tributaries/confluences/direction of flow etc)
CORE HIGHER GEOGRAHY TEXTBOOK Answer questions 1 4 on page 72 Maps on page 73