東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Environmental Risk Assessment and Ad...

Neumann, Alexey.

FindBook

Google Book

Amazon

博客來

Environmental Risk Assessment and Adaptive Management Implementation in Lake Simcoe, Ontario.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Environmental Risk Assessment and Adaptive Management Implementation in Lake Simcoe, Ontario./
作者:	Neumann, Alexey.
面頁冊數:	245 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
Contained By:	Dissertation Abstracts International76-08B(E).
標題:	Environmental Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3687495
ISBN:	9781321650785

Environmental Risk Assessment and Adaptive Management Implementation in Lake Simcoe, Ontario.
Neumann, Alexey.

Environmental Risk Assessment and Adaptive Management Implementation in Lake Simcoe, Ontario. - 245 p.

Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2014.

This item must not be sold to any third party vendors.

Addressing the problems of low deep-water oxygen concentrations and impairment of cold-water fish habitats in Lake Simcoe as a case study of a dimictic mesotrophic lake requires reduction of external phosphorus (P) loading. However, the efficiency of restoration efforts can be hindered by persistent internal P loading. This thesis develops a series of ecological and biogeochemical models, aiming at advancing our understanding of internal P recycling mechanisms in mesotrophic dimictic lakes. Special emphasis is given to sediment diagenesis processes and their interplay with the water column, macrophyte-mediated P retention, and the nutrient nearshore shunt induced by dreissenids. First, a continuous Bayesian network is presented to investigate the cause-effect relationships among physical conditions, ambient nutrient concentrations, and plankton dynamics. P sediment internal loading is subsequently quantified with a reactive-transport simulation model of the transformation of P binding forms. Sediment dynamics are then assessed under conditions of varying organic matter sedimentation and hypolimnetic oxygen levels. Finally, an integrated P mass-balance model is used to elucidate the internal P fluxes stemming from sediments, macrophytes and dreissenids. The model predicts that P diffusive fluxes from the sediments account for less than 30-35% of the exogenous P loading in Lake Simcoe. In the post-dreissenid invasion era, the limited decrease of the ice-free TP concentrations is indicative of the presence of active nutrient recycling pathways, potentially magnified by the particular morphological features and hydrodynamic patterns of Lake Simcoe, which counterbalance the direct effects of dreissenid filtration.

ISBN: 9781321650785Subjects--Topical Terms:

676987
Environmental Sciences.

Environmental Risk Assessment and Adaptive Management Implementation in Lake Simcoe, Ontario.
LDR:02733nmm a2200301 4500 001 2057617
005 20150630115552.5
008 170521s2014 ||||||||||||||||| ||eng d
020 $a 9781321650785
035 $a (MiAaPQ)AAI3687495
035 $a AAI3687495
040 $a MiAaPQ $c MiAaPQ
100 1 $a Neumann, Alexey. $3 3171487
245 1 0 $a Environmental Risk Assessment and Adaptive Management Implementation in Lake Simcoe, Ontario.
300 $a 245 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
500 $a Adviser: George B. Arhonditsis.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2014.
506 $a This item must not be sold to any third party vendors.
520 $a Addressing the problems of low deep-water oxygen concentrations and impairment of cold-water fish habitats in Lake Simcoe as a case study of a dimictic mesotrophic lake requires reduction of external phosphorus (P) loading. However, the efficiency of restoration efforts can be hindered by persistent internal P loading. This thesis develops a series of ecological and biogeochemical models, aiming at advancing our understanding of internal P recycling mechanisms in mesotrophic dimictic lakes. Special emphasis is given to sediment diagenesis processes and their interplay with the water column, macrophyte-mediated P retention, and the nutrient nearshore shunt induced by dreissenids. First, a continuous Bayesian network is presented to investigate the cause-effect relationships among physical conditions, ambient nutrient concentrations, and plankton dynamics. P sediment internal loading is subsequently quantified with a reactive-transport simulation model of the transformation of P binding forms. Sediment dynamics are then assessed under conditions of varying organic matter sedimentation and hypolimnetic oxygen levels. Finally, an integrated P mass-balance model is used to elucidate the internal P fluxes stemming from sediments, macrophytes and dreissenids. The model predicts that P diffusive fluxes from the sediments account for less than 30-35% of the exogenous P loading in Lake Simcoe. In the post-dreissenid invasion era, the limited decrease of the ice-free TP concentrations is indicative of the presence of active nutrient recycling pathways, potentially magnified by the particular morphological features and hydrodynamic patterns of Lake Simcoe, which counterbalance the direct effects of dreissenid filtration.
590 $a School code: 0779.
650 4 $a Environmental Sciences. $3 676987
650 4 $a Biology, Limnology. $3 1018638
650 4 $a Engineering, Environmental. $3 783782
690 $a 0768
690 $a 0793
690 $a 0775
710 2 $a University of Toronto (Canada). $b Geography. $3 2122921
773 0 $t Dissertation Abstracts International $g 76-08B(E).
790 $a 0779
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3687495