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Statements

Subject Item
dbr:Meander_cutoff
rdfs:label
Potongan kelokan 曲流切斷 Mäanderdurchbruch Meander cutoff Coupure de méandre
rdfs:comment
Potongan kelokan merupakan proses evolusi sungai yang terjadi ketika lengkungan kelokan sungai terpotong oleh sebuah saluran luncur yang kemudian menghubungkan kedua lengkungan sungai yang saling berdekatan tersebut. Hal ini akan menyebabkan aliran air akan cenderung mengalir ke kanal sungai yang memiliki kemiringan lebih rendah dan mengabaikan kedua lengkungan yang saling bertemu tadi. Potongan sungai merupakan proses evolusi alami pada kelokan sungai dan juga merupakan perilaku alami sungai dalam memilih jalur air mengalir sependek mungkin. Kedua lengkungan sungai yang telah bersatu tadi kemudian akan berkembang menjadi danau tapal kuda. En sédimentologie et en géomorphologie, une coupure de méandre se produit quand deux coudes d'un méandre se rejoignent. Cela provoque ensuite l'abandon du méandre qui souvent devient un bras mort. A meander cutoff is a natural form of a cutting or cut in a river occurs when a pronounced meander (hook) in a river is breached by a flow that connects the two closest parts of the hook to form a new channel, a full loop. The steeper drop in gradient (slope) causes the river flow gradually to abandon the meander which will silt up with sediment from deposition. Cutoffs are a natural part of the evolution of a meandering river. Rivers form meanders as they flow laterally downstream, see sinuosity. 當河流中的彎曲被連接彎曲的兩個最近部分的斜槽通道破壞時，發生曲流切斷。這導致流動放棄曲折，並繼續直下坡。截面是蜿蜒河流演化的一個自然部分，也被用來人為縮短蜿蜒河流的航行長度。河的停滯部分有時會形成牛軛湖。
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dbpedia-az:Yarılmış_meandr dbpedia-fa:میان‌بر_پیچان‌رود wikidata:Q2478493 dbpedia-zh:曲流切斷 dbpedia-fr:Coupure_de_méandre dbpedia-id:Potongan_kelokan dbpedia-de:Mäanderdurchbruch n19:2LE23 freebase:m.0gfj9kv
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dbo:abstract
A meander cutoff is a natural form of a cutting or cut in a river occurs when a pronounced meander (hook) in a river is breached by a flow that connects the two closest parts of the hook to form a new channel, a full loop. The steeper drop in gradient (slope) causes the river flow gradually to abandon the meander which will silt up with sediment from deposition. Cutoffs are a natural part of the evolution of a meandering river. Rivers form meanders as they flow laterally downstream, see sinuosity. Meandering rivers flow higher and hence with more total flow, pressure and erosion on the outside of their bends due to forming a vortex as in a stirred coffee cup and consequently the river erodes more the outer bank. On the inside bend of a river, the level is lower, secondary flow moves sand and gravel across the river bed creating shallows and point bars, and friction of air and perturbances of the bed act against a higher proportion of the column of water, being shorter, slowing the water to varying degrees. Rivers are commonly described and interpreted by their sinuosity. The term is equally used to describe the actual incidence of and potential tendency of a river to curve or meander over its length. It is expressed as the ratio of the distance between two distant points in a river following the middle-of-the-river course of the river as compared with the straight distance between those points. Three conventional categorizations of rivers or their reaches exist. Meandering rivers have a sinuosity value/ratio of greater than 1.5. A sinuosity value of less than 1.1 is a “straight” river. Between these values, a river is described as sinuous which describes those in a transitory state between the two states. Braided rivers do not follow this same convention. Meandering rivers trend in the direction of increasing sinuosity. Potongan kelokan merupakan proses evolusi sungai yang terjadi ketika lengkungan kelokan sungai terpotong oleh sebuah saluran luncur yang kemudian menghubungkan kedua lengkungan sungai yang saling berdekatan tersebut. Hal ini akan menyebabkan aliran air akan cenderung mengalir ke kanal sungai yang memiliki kemiringan lebih rendah dan mengabaikan kedua lengkungan yang saling bertemu tadi. Potongan sungai merupakan proses evolusi alami pada kelokan sungai dan juga merupakan perilaku alami sungai dalam memilih jalur air mengalir sependek mungkin. Kedua lengkungan sungai yang telah bersatu tadi kemudian akan berkembang menjadi danau tapal kuda. 當河流中的彎曲被連接彎曲的兩個最近部分的斜槽通道破壞時，發生曲流切斷。這導致流動放棄曲折，並繼續直下坡。截面是蜿蜒河流演化的一個自然部分，也被用來人為縮短蜿蜒河流的航行長度。河的停滯部分有時會形成牛軛湖。 En sédimentologie et en géomorphologie, une coupure de méandre se produit quand deux coudes d'un méandre se rejoignent. Cela provoque ensuite l'abandon du méandre qui souvent devient un bras mort.
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