![]() ![]() ![]() In tidal rivers' deltas, mineral and water extraction, reduced sediment input, and floodplain engineering are causing the sinking of deltas. Tidal rivers face threats due to climate change and other human-caused impacts. Some challenges to estimating discharge amounts include reversing tidal flow, compensation flow for Stokes drift, spring-neap water storage effects, lateral circulation, and multiple distributaries or ebb and flood channels. These discharge amounts can be estimated using tidal statistics. Discharge estimates from freshwater tidal rivers are important for informing water resource management and climate analyses. Rivers contribute about 95% of sediment entering the ocean. This is a necessary influx for the global water balance. įreshwater tidal rivers discharge large amounts of sediment and nutrients into the ocean. A phenomenon commonly associated with tidal rivers is a tidal bore, where a wall of water travels upriver during a flood tide. Areas of brackish water seaward of the tidal river section are often called estuaries. If that is the case, this section of river can be known as a "tidal freshwater river" or a "river reach." In terms of tides, tidal rivers are classified as microtidal (4 m). By this definition, a tidal river will be affected by tides, surges, and sea level variation, though its water may not have a high salinity content. This classification is based on both tidal trends and salinity. The term "tidal river" generally encompasses the area upriver of the maximum limit of salinity intrusion and downriver of tidal water level fluctuations. The area of a tidal river can be difficult to define. Oregon's Coquille River is one such stream for which that effect can be noticed. High tides can be noticed as far as 100 kilometres (62 mi) upstream. In some cases, high tides impound downstream flowing freshwater, reversing the flow and increasing the water level of the lower section of river, forming large estuaries. Generally, tidal rivers are short rivers with relatively low discharge rates but high overall discharge, which generally implies a shallow river with a large coastal mouth. A section of a larger river affected by the tides is a tidal reach, but it may sometimes be considered a tidal river if it had been given a separate and another title name. For the locality and camping ground near the river, see Tidal River, Victoria.Ī tidal river is a river whose flow and level are caused by tides. For the river in the Australian state of Victoria, see Tidal River (Victoria). This article is about tidal rivers in general. ![]()
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