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hypolimnion

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hypolimnion
hypolimnion (haɪpəʊˈlɪmnɪən) Pl. hypolimnia. [f. hypo- 2 + Gr. λιµνίον, dim. of λίµνη lake.] The lower, cooler layer of water below the thermocline in a stratified lake.1910, 1936 [see epilimnion]. 1957 G. E. Hutchinson Treat. Limnol. I. v. 341 The hypolimnia of all lakes. 1960 New Scientist 31 Mar.... Oxford English Dictionary
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Hypolimnion
The hypolimnion or under lake is the dense, bottom layer of water in a thermally-stratified lake. The word "hypolimnion" is derived from . Oxygen dynamics The deepest portions of the hypolimnion have low oxygen concentrations. In eutrophic lakes, the hypolimnion is often anoxic. wikipedia.org
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Epilimnion
As a result, the epilimnion sits above the deeper metalimnion and hypolimnion, which are colder and denser. Additionally, the epilimnion is typically has a higher pH and higher dissolved oxygen concentration than the hypolimnion. wikipedia.org
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monimolimnion
monimolimnion (ˌmɒnɪməʊˈlɪmnɪən) Pl. -limnia. [a. G. monimolimnion (I. Findenegg 1935, in Internat. Rev. d. ges. Hydrobiol. u. Hydrographie XXXII. 377), f. Gr. µόνιµο-ς stable + -limnion, after epilimnion, hypolimnion.] The lower, denser, non-circulating layer of a meromictic lake. Cf. mixolimnion.1... Oxford English Dictionary
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mixolimnion
mixolimnion (mɪksəʊˈlɪmnɪən) Pl. -limnia. [f. mixo- + -limnion, after epilimnion, hypolimnion.] The upper, freely circulating layer of a meromictic lake. Cf. monimolimnion.1937 G. E. Hutchinson in Trans. Connecticut Acad. Arts & Sci. XXXIII. 74 A meromictic lake may be regarded as consisting of an u... Oxford English Dictionary
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Hypolimnetic aeration
The hypolimnion becomes inhospitable, and the anaerobic conditions contribute to greater phosphate dissolution from the sediments into the deep water; The outlet is designed to provide a smooth, laminar flow and horizontal outflow into the hypolimnion. wikipedia.org
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epilimnion
epilimnion (ɛpɪˈlɪmnɪən) Pl. epilimnia. [f. epi- + Gr. λιµνίον, dim. of λίµνη lake.] The upper, uniformly warm layer of water in a stratified lake: cf. hypolimnion. Hence epilimˈnetic [cf. Gr. λιµνήτης living in marshes], epiˈlimnial adjs., situated in or relating to the epilimnion.1910 E. A. Birge ... Oxford English Dictionary
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Monomictic lake
When DO is lowered in the hypolimnion, nutrients like ammonium, nitrate, and phosphates tend to dominate. Upon addition of this water back into the hypolimnion, cyanobacteria growth is limited. wikipedia.org
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discontinuity
discontinuity (dɪsˌkɒntɪˈnjuːɪtɪ) [f. med.L. type *discontinuitās, f. discontinu-us: see next and -ity. Cf. F. discontinuité (1775 in Hatz.-Darm.).] 1. a. The quality or state of being discontinuous; want or failure of continuity or uninterrupted sequence; interrupted condition.1570 Dee Math. Pref. ... Oxford English Dictionary
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Dimictic lake
This results in dimictic lakes have a strong thermal stratification, with a warm epilimnion separated from the cold hypolimnion by the metalimnion. If a lake is eutrophic and has a high sediment oxygen demand, the hypolimnion in dimictic lakes can become hypoxic during summer stratification, as often wikipedia.org
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which layer of the lake is coldest
The word hypolimnion is derived from the Greek "limnos" meaning "lake" It is the layer that lies below the thermocline.
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Lake stratification
Cold water is denser than warm water and the epilimnion generally consists of water that is not as dense as the water in the hypolimnion. It also poses a risk of oxygen sag as a long established hypolimnion can be anoxic or very low in oxygen. wikipedia.org
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طبقة مائية عليا
الطبقة المائية العليا في البحيرات الطبقة الدافئة جيدة التهوية (بالإنجليزي: Epilimnion) في حين تسمى الطبقة السفلية الطبقة المائية الباردة (بالإنجليزي : hypolimnion wikipedia.org
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Chemical phosphorus removal
Implementation For most alum treatments, aluminum sulfate salt is applied to substrate at the lake's bottom, within the hypolimnion. Although alum is typically applied to the hypolimnion, reducing phosphorus universally within the lake, it may also be applied to the epilimnion or locally wikipedia.org
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طبقة مائية سفلية
طبقة مائية سفلية (الإنجليزي: Hypolimnion) تقع أسفل الطبقة الحرارية في البحيرات وهي ذات كثافة عالية . wikipedia.org
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