SOURCE The source or headwaters of a river or stream is the place from which the water in the river or stream originates. There is no universally agreed upon definition such that any stream's source can be systematically determined. The United States Geological Survey USGS states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source irrespective of stream name or from the mouth to the headwaters of the stream commonly identified as the source stream".
By another definition a source can be defined specifically as the most distant point from the river mouth in the drainage basin from which water runs year-around perennially, or, alternatively, as the furthest point from which water could possibly flow ephemerally. As the river wanders between banks that are far apart, the promontories of the hills tend to jut out into the river valley in a staggered formation, interlocked together in a formation like the teeth of a zip.
These promontories are referred to as interlocking spurs. While similar in general appearance, the mechanism behind the formation of interlocking spurs is different to that behind meandering and they should not be confused. If the valley experiences glaciation, the interlocking spurs are foreshortened as the tips are sheared off. These are referred to as truncated spurs.
How interlocking spurs are formed: Vertical erosion creates a narrow valley. They line up one after the other. A meander is formed when the moving water in a river erodes the outer banks and widens its valley.
A stream of any volume may assume a meandering course, alternatively eroding sediments from the outside of a bend and depositing them on the inside. The result is a snaking pattern as the stream meanders back and forth across its down-valley axis. When a meander gets cut off from the main stream, an oxbow lake is formed. Over time meanders migrate downstream, sometimes in such a short time as to create civil engineering problems for local municipalities attempting to maintain stable roads and bridges.
There is not yet full consistency or standardization of scientific terminology used to describe watercourses. A variety of symbols and schemes exist. Parameters based on mathematical formulae or numerical data vary as well, depending on the database used by the theorist. Unless otherwise defined in a specific scheme "meandering" and "sinuosity" here are synonymous and mean any repetitious pattern of bends, or waveforms. In some schemes, "meandering" applies only to rivers with exaggerated circular loops or secondary meanders; that is, meanders on meanders.
Sinuosity is one of the channel types that a stream may assume over all or part of its course. All streams are sinuous at some time in their geologic history over some part of their length. It includes the floodway, which consists of the stream channel and adjacent areas that carry flood flows, and the flood fringe, which are areas covered by the flood, but which do not experience a strong current.
ESTUARY An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea.
Estuaries are thus subject to both marine influences, such as tides, waves, and the influx of saline water; and riverine influences, such as flows of fresh water and sediment. As a result they may contain many biological niches wi. The very good thing, I liked is their support response which is very polite and prompt. This product is designed very well, and they are doing their best by releasing updates almost every month. I have been using the software for my entire group.
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As the river flows downstream, it gains more water from other streams, rivers, springs, added rainfall, and other water sources. What is a river? A river is freshwater flowing across the surface of the land, usually to the sea.
30 rows · Other major rivers include the Thames, which flows through Oxford and London, and the .
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