![]() ![]() L'âge, la distribution et la densité de deux populations du liard des prairies ( Populus deltoides var. ![]() Based on this study, the prospects for cottonwood survival on floodplains downriver from dams in this and other prairie river valleys are not encouraging unless management measures are taken to reverse the trend. Results suggest that this is due to a marked reduction in flood magnitude and frequency, rates of sedimentation and meander migration. In Montana, on the floodplain for 25 km downstream of Fresno Dam, built in 1939, the densities of cottonwoods recruited since 1939 are significantly lower than on floodplain sites upstream, in Alberta. Such flood events during the seed dispersal period recur an average of once in 5 years. In Alberta, cottonwood recruitment leading to long-term survival on river meander lobes (point bars) correlates with years when daily maximum flows during the period of seed dispersal (June 1 to July 10) attain a stage equal to or greater than the 2-year return flood, based on the annual flood series. occidentalis Rydb.) on the floodplain of the Milk River, southern Alberta and northern Montana, were studied in relation to historical river hydrology and sedimentation regimes. South is at the top of the plan.Age, distribution, and density of two populations of plains cottonwood ( Populus deltoides var. Some studies of East Asia… … UniversaliumĪrt collections of Holkham Hall - Holkham Hall in Norfolk has extensive contents which include:Collections [ piano nobile at Holkham, showing the four symmetrical wings at each corner of the principal block. The literatures of these countries are covered in the articles Chinese literature, Korean literature, and Japanese literature. Compare: meander scroll.… … Glossary of landform and geologic termsĪrts, East Asian - Introduction music and visual and performing arts of China, Korea, and Japan. Point bar - 1) One of a series of low, arcuate ridges of sand and gravel developed on the inside of a growing meander by the slow addition of individual accretions accompanying migration of the channel toward the outer bank. ![]() HP … Glossary of landform and geologic termsīar - 1) a) A general landform term for a ridge like accumulation of sand, gravel, or other alluvial material formed in the channel, along the banks, or at the mouth of a stream where a decrease in velocity induces deposition e.g … Glossary of landform and geologic termsīar and channel topography - A local scale topographic pattern of recurring, small, sinuous or arcuate ridges separated by shallow troughs irregularly spaced across low relief flood plains(slopes generally 2 –6 %) the effect is one of a subdued, sinuously undulating… … Glossary of landform and geologic terms a similar stream of something other than water: a… … Universaliumįlood-plain landforms - A variety of constructional and erosional features produced by stream channel migration and flooding, e.g., backswamp, braided stream, flood plain splay, meander, meander belt, meander scroll, oxbow lake, and natural levee. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. In addition to meanders, scroll plains are also characterised by many oxbow lakes.Examples of scroll plainsNew… … Wikipedia Scroll plain - A scroll plain occurs where a river meanders across an area with a very low gradient, usually with a fairly continuous discharge. Meanders develop, which lengthen the course of… … Wikipedia The maximum gradient is along the down valley axis represented by a hypothetical straight channel. A hypothetical stream bed following a tilted valley. Meander - For other uses, see Meander (disambiguation). Scroll - (not preferred) refer to meander scroll … Glossary of landform and geologic terms ![]()
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