The characteristics of Bangladesh and the possible causes of flooding.
The characteristics of Bangladesh and the possible causes of flooding. Bangladesh is situated between 22° and 27° North, either side of the tropic of cancer. It is bordered by India to the West, North and East, and by Myanmar to the South East. It is South of the Himalayas and North of the Bay of Bengal. Bangladesh Is very flat (all less than 200m ASL [above sea level], with 15% of land being less than 15m ASL. There are two main rivers in Bangladesh, The River Ganges and The River Brahmaputra. There are 230 river and tributaries in Bangladesh in total, which all drain southwards. The quality of life in Bangladesh is low, as both the population density and the death rate are high, and both Life expectancy and adult literacy are low. The land in the Delta (towards the Bay of Bengal) is vastly used for arable crops, as it is so fertile and flat. Most people in Bangladesh earn their living through farming, so they have to grow lots of food. The silt in the delta was eroded by the surface runoff picking up soil from fields, and by abrasion of the riverbed. It is transported by the sea waves, and by longshore drift. The flooding in Bangladesh is due mainly to the low-lying, flat ground, which makes the water spread out easily. The drainage density is high, so there is lots of water to create a flood, and coastal cyclones can sweep across the low-lying coast.
River channel processes.
Geography revision. RIVER CHANNEL PROCESSES How are things transported in a river? - SUSPENSION, this is where solid particles are suspended in the river - TRACTION. This is where the bedload is rolled along the bottom of river by the force of the water above it. - SOLUTION. This is when chemicals, e.g. co2 dissolve in the water and are transported while dissolved in the river. - SALTATION. This is when rocks bounce along each other, thus being transported done the river. The amount of sediment shifted depends on these factors, - NATURE OF BED AND BANKS. Is the river cutting loose gravel or solid rock. Is it travelling over chalk or limestone? - FLOW OF THE RIVER. The speed at which river flows through its channel. If its flows are constant or do they fluctuate. - HUMAN INTERVENTION. If a dam has been built or not. What erosional processes do rivers go through. - CORRASION (is abrasion). This is when the particles that are suspended within the river rub against the bed or bank, wearing them down. - SOLUTION. This is when the minerals dissolved in the water reaction with the bed or banks. E.g. co2 dissolved in the water can form a weak acid and therefore eat away at limestone etc. - HYDRAULIC ACTION. This is used when referring to the sheer force of the water hitting the bed and banks. This type of erosion is particularly abundant at waterfalls. What controls
Styal Mill Coursework
Styal Mill Coursework Question 1 Greg built Styal Mill during the industrial revolution. During the industrial revolution machinery was getting bigger and more dangerous; therefore it could no longer be used in homes. Styal Mill and many factories were built for the machinery to be used in them. Many Entrepreneurs were looking for sites to build mills on. Greg made several visits the countryside in and around Manchester. Finally he decided on Styal, a small hamlet north of Wilmslow. Styal is located close to Manchester, the Bridge water canal is only 8 miles away and the land was big enough. One of the important reasons Greg chose the site is because of the transport links. The bridge water canal would provide easy shipping of cotton near to the mill, then the last few miles would have to be done by horse and cart. Manchester is close to Styal, this is good because Manchester was one of the biggest industrial cities and this would provide Greg with workers and raw materials. Liverpool is relatively close to Styal. Geographical factors also played a part in the choosing of the Styal location because on that land the river Bolin flowed through. Greg used the river Bolin as a power source for his mill and the machinery. Arkwrites water frame was invented to use the water to drive the wheel and drive lots of cogs and shafts that made the machinery run. Another factor is the
Needs somebody like a secretary to help him out with his paperwork. But the main problem is that he urgently needs somebody to help him out with his paperwork such as mail merging his documents of prospective clients.
Identify The Problem Statement My next door neighbour called John is a newly qualified lawyer. His business is set up in a remote area of England in the Lake District and needs somebody like a secretary to help him out with his paperwork. But the main problem is that he urgently needs somebody to help him out with his paperwork such as mail merging his documents of prospective clients. He has a shortage of money too. So what I have suggested is that for the time being is that I will help him out with mail merging his documents as he is lacking in this section. Analysis of Data - Showing what my Graphs show RG1 - From looking at this graph I can say that from site 1 to site 2 the width in the river increases from 8 to 9 m which means that the river is getting wider by a total of 2m. After this point on the graph between site 2 and 3, the stream width of the river lies stable at 9m which shows that the river width is steady. The river then starts to get wider at site 4 to 10m and then suddenly decreases to just over 7.25m. Between site 5 and site 8 I can say that the width of the river has gotten wider by a total of 7.04m. From this inclination I can say that the general trend of the river width shows that the river pattern is not fluctuating too much in terms of the width constantly changing from decreasing and increasing but is instead increasing at a steady rate. This
Case Study: Water Management Scheme/Flood Control
Case Study: Water Management Scheme/Flood Control Aswan Dam, Egypt * The Aswan Dam is in Egypt, which is in Africa. The dam is on the river Nile which is 6698km long, the dam is 3600km and extends 480km into Sudan. * Aswan is about 200km away from the Egyptian coast bordering the Red Sea * Is about 700km south of Cairo - the capital of Egypt * About 800km South of the Mediterranean Sea * About 230km North of the Border of Sudan * About 800km West of the Border of Libya The features of the dam were: * To prevent flooding of the land around the river Nile. * Provides Electricity - 12 turbines that generate over 10 billion kilowatts of electricity every year. * Provides a more reliable source of water for increasing population. * Enabled fish to breed in the reservoir so more fish can be caught and used at food. * The scheme was necessary because the Nile over flowed and flooded the land around it for 2-3 months of the year which made farming hard as the farmers never knew when the Nile was going to flood and how long the floods will last, meaning that they get less food for them to survive on. The dam created a huge reservoir, which was to, controlled the flooding. * Millions of tons of sediment that was used to fertilise the farms now gets trapped in the dam. The farmers now have to use chemical fertilisers, which costs them a lot money and causes pollution. *
'How and why do the characteristics and processes of a river and its valley, vary the channel and downstream'.
Chapter 1 - Introduction During the course of this essay I will be discussing the issue of 'How and why do the characteristics and processes of a river and its valley, vary the channel and downstream'. I will be using the data that I have collected and other sources of information to investigate and evaluate how this natural process occurs. My hypotheses that I had before I collected the data on my trip to the Sai Kung Country Park where... * as the velocity of the river decreases as we move downstream * the size of the load will decrease when we move down stream And * discharge of the river increases as we move downstream I have came up with these hypotheses by researching and back ground nosegay. I also have light understanding on how rivers change though the course from past geography lessons. The area which we have been studying is suited in Hong Kong which is in Eastern Asia, bordering the South China Sea and China. Hong Kong's climate consists of tropical monsoon; cool and humid in winter, hot and rainy from spring through summer, warm and sunny in fall. The terrain of Hong Kong is hilly to mountainous with steep slopes there are also lowlands in north. Hong Kong's population has been rising significantly in the past decade. The population estimate is around 7.5 million. There is also a very high water demand in Hong Kong. Due to this problem Hong Kong has
Using Case Studies And Examples, Describe And Explain The Landforms Found In The Glacial Landscape
Using Case Studies And Examples, Describe And Explain The Landforms Found In The Glacial Landscape It appears that roughly every 200-250 million years in the Earth's history there have been major periods of ice activity. The most recent of these occurred during the Pleistocene period of the Quaternary era. In the 2 million years since the onset of the Quaternary, there have been fluctuations in global temperature of between 5°C and 6°C, which have led to glacials and interglacials. In these periods, glaciers form and create many different landforms, either through erosion or deposition. Glaciers are capable of moving large quantities of debris. The rock debris may be transported in one of three ways: - Supraglacial debris is carried on the surface of the glacier as lateral and medial moraine - Englacial debris is material carried within the body of a glacier - Subglacial debris is moved along the floor of the valley by the ice, or by meltwater streams formed by pressure melting. Ice that is stationary or contains little debris has limited erosive power, whereas moving ice carrying with it much morainic material can drastically alter the landscape. Virtually all the glacial processes of erosion are physical, as the climate tends to be too cold for chemical reactions to take place. There are five main processes associated with glacial erosion: - Frost Shattering -
A survey of the river Alyn in Wales
Introduction On Monday 5th of July we went and conducted a survey of the river Alyn in Wales, in Loggerheads. We looked at 4 river sections and did several tests to find the velocity, width and depth of the river we also recorded the sizes of 30 pebbles from each section. We did this to test a number of hypotheses. It took us approximately an hour and a half to arrive there and the weather was bright and warm with little cloud cover, this was quite unexpected because on previous weeks it had been raining. The sites we visited were: (187,575)(188,198)(174,617)(196,629)(please see map on next page) Hypotheses * Is velocity related to depth? * Do the particles in the bedload of a river become more rounded downstream? * Is the pebble size related to discharge? For the first hypothesis I expect to find that the deeper the river the more velocity, I think this because there is going to be more water so therefore more pressure in the river. For my second hypothesis I expect to find that the particles are more rounded down stream because the friction in the river should wear them down more and round them off. And lastly for my third hypothesis I think that the size of the pebble is not related to discharge because discharge is the amount of water which flows through the river at any given time and it's not what wears down pebble size (this is friction) Methodology To
In what ways and for what reasons do the landforms of upland glaciated regions differ from those of lowland glaciated regions?
Geography Essay 2000. In what ways and for what reasons do the landforms of upland glaciated regions differ from those of lowland glaciated regions? (15 marks) Glaciers' are extremely vigorous, moving masses of ice on land. They are examples of open systems. Their main output is snow either from direct snowfall or from avalanches. It accumulates in the upper part of a glacier, which looks white. The snow is stored in the system as glacier ice and is carried down slope by the glacier's movement. The main output is water. Although some water evaporates directly from the surface into the atmosphere, mass water loss results from melting as lower altitudes, or latitudes with higher temperatures are reached. Therefore, there are various landforms, which develop as a glacier follows its course. The upland glaciated regions differ from the lowland glaciated regions due to a number of factors. Valley glaciers are powerful agents of erosion. They have contributed greatly to the spectacular scenery found in many mountainous areas, being directly responsible for deepening pre-existing river valleys. By doing this, they have exaggerated, in quite a dramatic manner, the vertical differences between frost-shattered peaks above and flat valley floors below. Although a smooth valley cross-profile is created, the dominant feature of the long profile of a glaciated valley is its irregularity.
How may knowledge of the hydrological cycle and its components assist in devising flood prevention measures?
How may knowledge of the hydrological cycle and its components assist in devising flood prevention measures? The hydrological cycle is responsible for the circulation of water around the Earth, between the different systems in the planet. The knowledge of the entire cycle and its components, including precipitation, the different flows and stores involved in the cycle, one is able to gain insights into the movement of water and thus devise means to prevent floods. The key aspect of the hydrological cycle is that of the water input on land, which is precipitation. Understanding the seasonal variations in the inputs would allow us to gain insights into the seasonality of flooding and possibly even the frequency of flooding in a given area. As such, water at dams can be released at appropriate times so that the lakes can subsequently be used to hold back floodwaters when the high intense precipitation sets in. This way, flooding can be prevented. Precipitation in the form of snow would spend longer time on the land as it flows into channels only when they melt. Knowledge of the volume of water contained in the snow and the time taken for the melting would help assess if the area has the capacity to hold the water formed from snow melt. Flood can be prevented by attempting to melt some of the snow 1 during the winter time and allowing greater
