Subjects: Philosophy, classics, music tech and geography
Notes and Version for Geography:
Links: https://sites.google.com/a/halliford.net/a-level-geography/home/exam-materials http://coolgeography.co.uk/A-level/AQA/AQA%20A%20level.htm http://web.aqa.org.uk/qual/gce/humanities/geography_materials.php
Topic 1: Rivers and Flood Managing.
A drainage basin is definitely an area drained by it is rivers and tributaries. It is just a natural system with diverse inputs of precipitation and varied outputs of normal water, for example , advices: rain, blizzards, outputs: evaporation, transpiration, and evapotranspiration and river circulation. When the advices and the outputs balance out it really is called the balance. The summary of water stability: Precipitation= evaporation + transpiration + river flow & storage NOTE: water is definitely stored in porous rocks, soils, peat and vegetation. During heavy rainfall or a monsoon the water or " precipitationвЂќ storage is high. However when there is tiny rain or a drought then a precipitation storage area is exhausted. River Discharge:
The river discharge is definitely the volume of drinking water that moves in a lake channel (usually per second) A few examples of FACTORS impacting and impacting on river discharge: Geology: poroso rocks just like chalk might store almost all of the precipitation then release this slowly. This kind of reduces the discharge. On the other hand impermeable rocks have the opposite effects. Ski slopes: water will move slower through or across milder slopes than it does on sheer or steeper inclines. If the incline is high it is usually located upstream, also with steep inclines rapid drinking water movement takes place which causes river. With milder slopes which have been usually located downstream, water flows softly, hence the name. Soil: same results as poroso rocks yet once the ground storage turns into too high this particular will not be assimilated. Impermeable soil like clay soils tend not to absorb drinking water at all also increase discharge. Drainage denseness: the length of a channel in kilometres squared. With substantial drainage denseness there is a decline in the time considered for area and subsurface water to get transferred to river channels. Vegetation/ interception: if you have masses of ground or above ground plants precipitation will certainly, either way, become decreased. The vegetation previously mentioned ground intercepts the anticipation falling from the sky. The few drops that make it through either gets absorbed by trees or are intercepted once again by walk out vegetation like bushes or large crops. Vegetative interception is a key factor INFLUENCING the river discharge. Terrain use: manmade drainage can intercept the rainfall. If perhaps rain has to flow through a town to get to a lake it is extremely likely that some or most of it will fall down a drain. Though the drain will likely reach the river ultimately but on the great time frame. The process of normal water evaporation as well as the cycle showing how it results to the riv it evaporated from is named the hydrological cycle
The storm hydrograph records the varying in rain fall over a particular length of time.
Here is a labelled tornado hydro graph. I will feel the labels and their meanings. Rising limb: " the increase in discharge in response to precipitationвЂќ the higher the rising limb, the faster the water made it to the river. Precipitation: usually in millimetres, how much rain that fell in the time which has been recorded. The long account:
The extended profile is definitely the length from the source to the mouth of a river. Many rivers will be concave in long profile; this is certainly known as a graded profile, having a relatively brief (but steep) section near to the source (usually upstream) and a longer section with mild gradients close to the mouth (usually downstream). In the long account of a river many processes happen to support either form the river, landscape it or transporting and eroding yeast sediment.
An example of a long profile in SECOND...