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Resolving spatiotemporal characteristics of the seasonal hypoxia cycle in shallow estuarine environments of the Severn River and South River, MD, Chesapeake Bay, USA

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ABSTRACT

The nature of emerging patterns concerning water quality stressors and the evolution of hypoxia within sub-estuaries of the Chesapeake Bay has been an important unresolved question among the Chesapeake Bay community. Elucidation of the nature of hypoxia in the tributaries of the Chesapeake Bay has important ramifications to the successful restoration of the Bay, since much of Bay states population lives within the watersheds of the tributaries. Very little to date, is known about the small sub-estuaries of the Chesapeake Bay due to limited resources and the difficulties in resolving both space and time dimensions on scales that are adequate to resolve this question. We resolve the spatio-temporal domain dilemma by setting up an intense monitoring program of water quality stressors in the Severn and South Rivers, MD. Volume rendered models were constructed to allow for a visual dissection of the water quality times series which illustrates the life cycle of hypoxia and anoxia at the mid to upper portions of the tidal tributaries. The model also shows that unlike their larger Virginian tributary counterparts, there is little to no evidence of severe hypoxic water intrusions from the main-stem of the Chesapeake Bay into these sub-estuaries.

No MeSH data available.


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Spatiotemporal model of hypoxia in the South River 2012.
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fig0040: Spatiotemporal model of hypoxia in the South River 2012.

Mentions: In order to capture a the complete life cycle of hypoxia within the small tributaries, monitoring in the South River began in early January of 2012. The spatiotemporal model for 2012, clearly indicates hypoxic conditions began around Julian week 18 and expand and contract throughout the water column until week 40. At week 40, mixing is the dominant processes and the hypoxia has disappeared (Fig. 8). Also important to note is that the hypoxic condition in the river only reaches the upper and middle portions of the river (9 km). Hypoxia is absent throughout the water column including bottom water for almost 8 km into the river from the mouth. The spatiotemporal hypoxic volume calculated was 88% for 5.0 mgl−1, 12% for 2 mgl−1.


Resolving spatiotemporal characteristics of the seasonal hypoxia cycle in shallow estuarine environments of the Severn River and South River, MD, Chesapeake Bay, USA
Spatiotemporal model of hypoxia in the South River 2012.
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037264&req=5

fig0040: Spatiotemporal model of hypoxia in the South River 2012.
Mentions: In order to capture a the complete life cycle of hypoxia within the small tributaries, monitoring in the South River began in early January of 2012. The spatiotemporal model for 2012, clearly indicates hypoxic conditions began around Julian week 18 and expand and contract throughout the water column until week 40. At week 40, mixing is the dominant processes and the hypoxia has disappeared (Fig. 8). Also important to note is that the hypoxic condition in the river only reaches the upper and middle portions of the river (9 km). Hypoxia is absent throughout the water column including bottom water for almost 8 km into the river from the mouth. The spatiotemporal hypoxic volume calculated was 88% for 5.0 mgl−1, 12% for 2 mgl−1.

View Article: PubMed Central - PubMed

ABSTRACT

The nature of emerging patterns concerning water quality stressors and the evolution of hypoxia within sub-estuaries of the Chesapeake Bay has been an important unresolved question among the Chesapeake Bay community. Elucidation of the nature of hypoxia in the tributaries of the Chesapeake Bay has important ramifications to the successful restoration of the Bay, since much of Bay states population lives within the watersheds of the tributaries. Very little to date, is known about the small sub-estuaries of the Chesapeake Bay due to limited resources and the difficulties in resolving both space and time dimensions on scales that are adequate to resolve this question. We resolve the spatio-temporal domain dilemma by setting up an intense monitoring program of water quality stressors in the Severn and South Rivers, MD. Volume rendered models were constructed to allow for a visual dissection of the water quality times series which illustrates the life cycle of hypoxia and anoxia at the mid to upper portions of the tidal tributaries. The model also shows that unlike their larger Virginian tributary counterparts, there is little to no evidence of severe hypoxic water intrusions from the main-stem of the Chesapeake Bay into these sub-estuaries.

No MeSH data available.


Related in: MedlinePlus