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Hydrochemistry in coastal blackwater...

Wahl, Matthew Henry.

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Hydrochemistry in coastal blackwater streams: The effects of urbanization.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hydrochemistry in coastal blackwater streams: The effects of urbanization./
Author:	Wahl, Matthew Henry.
Description:	138 p.
Notes:	Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4277.
Contained By:	Dissertation Abstracts International57-07B.
Subject:	Hydrology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9637176
ISBN:	9780591028980

Hydrochemistry in coastal blackwater streams: The effects of urbanization.
Wahl, Matthew Henry.

Hydrochemistry in coastal blackwater streams: The effects of urbanization. - 138 p.

Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4277.

Thesis (Ph.D.)--University of South Carolina, 1996.

The effect of coastal development on watershed loading was examined at three blackwater streams. Two streams represent urban-residential-agricultural drainage into an impacted high-salinity marsh, and the other stream represents undeveloped forested drainage into a relatively pristine high-salinity marsh (32 km south). Results for a 3-yr period (September 1990 through October 1993) indicated lower mean concentrations of dissolved organic carbon (DOC) in runoff from the urbanized watersheds (12.5 mg L

ISBN: 9780591028980Subjects--Topical Terms:

545716
Hydrology.

Hydrochemistry in coastal blackwater streams: The effects of urbanization.
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035 $a (UnM)AAI9637176
035 $a AAI9637176
040 $a UnM $c UnM
100 1 $a Wahl, Matthew Henry. $3 1920999
245 1 0 $a Hydrochemistry in coastal blackwater streams: The effects of urbanization.
300 $a 138 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4277.
500 $a Major Professor: Henry N. McKellar.
502 $a Thesis (Ph.D.)--University of South Carolina, 1996.
520 $a The effect of coastal development on watershed loading was examined at three blackwater streams. Two streams represent urban-residential-agricultural drainage into an impacted high-salinity marsh, and the other stream represents undeveloped forested drainage into a relatively pristine high-salinity marsh (32 km south). Results for a 3-yr period (September 1990 through October 1993) indicated lower mean concentrations of dissolved organic carbon (DOC) in runoff from the urbanized watersheds (12.5 mg L $\ sp{-1} \pm 0.3 $ se and 15.9 mg L $\ sp{-1} \pm 0.2 $ se) than from the forested watershed (25.6 mg L $\ sp{-1} \pm 0.7 $ se). The urbanized stream produced 72% greater annual volume (162 versus $9 4\times 10\sp3 $ m $\ sp3 $ yr $\ sp{-1} $) , and a 66% greater annual sediment load than the forested stream, despite its smaller watershed size (11 versus 37 ha). This greater volume combined with 3x higher mean annual NOx-N concentration (130 versus 43 $\ mu $g N L $\ sp{-1} $ yr $\ sp{-1}) $ resulted in 11x more NOx-N loading than at the forested stream (18.0 versus 1.6 kg N yr $\ sp{-1} $) . Dilution of DOC during the initial rise of stormwater (28 and 14% dilution) occurred at both streams, coinciding with rapid buildup of groundwater pressure. Groundwater DOC concentration decreased with depth (28 to 32% in the first 60 cm). Dilution of DOC was typically followed by pronounced increase (43 and 50% increase), that reached maximum DOC concentration just after peak discharge. The highest NH4-N concentrations occurred during low-flow, and stormwater discharge diluted high antecedant NH4-N concentrations at both streams (59 and 66% dilution on average). Build-up of NH4-N during stormwater recession at forested and urbanized streams averaged 81 and 163% higher than antecedant concentration. In contrast, NOx-N typically reached maximum concentration during rising stormwater just prior to peak discharge at forested and urbanized streams (12x and 6x average increase from pre-storm concentration). This pattern reflected an early increase and reduction of NOx-N (85 and 70% reduction). Surface water concentrations (106 to 438 $\ mu $g N L $\ sp{-1} $) were 1 to 2 orders of magnitude greater than that observed in saturated groundwater (0.5 to 2.5 $\ mu $ N L $\ sp{-1} $) , suggesting soil moisture was the predominant stormwater NOx-N source.
590 $a School code: 0202.
650 4 $a Hydrology. $3 545716
650 4 $a Environmental Sciences. $3 676987
650 4 $a Biology, Limnology. $3 1018638
690 $a 0388
690 $a 0768
690 $a 0793
710 2 0 $a University of South Carolina. $3 1017477
773 0 $t Dissertation Abstracts International $g 57-07B.
790 1 0 $a McKellar, Henry N., $e advisor
790 $a 0202
791 $a Ph.D.
792 $a 1996
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9637176