Geostatistical modeling of the spatial distribution of sediment oxygen demand within a Coastal Plain blackwater watershed.
Geostatistical modeling of the spatial distribution of sediment oxygen demand within a Coastal Plain blackwater watershed.
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DOI：
10.1016/j.geoderma.2010.06.015
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发表时间：
2010-10-15
期刊：
影响因子：
6.1
通讯作者：
Pringle CM
中科院分区：
文献类型：
--
作者：
Todd MJ;Lowrance RR;Goovaerts P;Vellidis G;Pringle CM
黑水溪流遍布美国东南部沿海平原，其特点是一系列的河流泛滥平原沼泽，这些沼泽在决定这些系统的水质方面起着关键作用。在乔治亚州，许多这样的河流被列入违反该州溶解氧（DO）标准的名单。先前的研究表明，河流洪泛平原沼泽的沉积物需氧量（SOD）升高，由于这些地区的需氧量旺盛，这些地点在决定整个流域的氧平衡方面起着重要作用。本研究还表明，SOD率与总有机碳浓度呈正相关。本研究在前人研究的基础上，利用地质统计学和序贯高斯模拟方法，研究了河段尺度上总有机碳（TOC）的斑块性和分布特征。这是通过插值TOC观测值和基于线性回归的模拟SOD速率实现的。此外，本研究确定了河流系统中具有代表性的3级和5级位置容易出现高SOD的区域。结果表明，超氧化物歧化酶与两个地点TOC分布差异具有空间相关性，这些分布差异可能是不同水文状况和流域位置的结果。在流域尺度上对洪泛区土壤的测绘表明，有机沉积物分布广泛，并且在高阶河流中更为普遍。黑水系统中的DO动态是自然和人为影响的复杂混合，但本文说明了河流沼泽在流域尺度上提高SOD的重要性。此外，我们的研究说明了河流沼泽对氧气需求的影响，同时为许多这些系统的天然DO含量低提供了支持。
Blackwater streams are found throughout the Coastal Plain of the southeastern United States and are characterized by a series of instream floodplain swamps that play a critical role in determining the water quality of these systems. Within the state of Georgia, many of these streams are listed in violation of the state’s dissolved oxygen (DO) standard. Previous work has shown that sediment oxygen demand (SOD) is elevated in instream floodplain swamps and due to these areas of intense oxygen demand, these locations play a major role in determining the oxygen balance of the watershed as a whole. This work also showed SOD rates to be positively correlated with the concentration of total organic carbon. This study builds on previous work by using geostatistics and Sequential Gaussian Simulation to investigate the patchiness and distribution of total organic carbon (TOC) at the reach scale. This was achieved by interpolating TOC observations and simulated SOD rates based on a linear regression. Additionally, this study identifies areas within the stream system prone to high SOD at representative 3rd and 5th order locations. Results show that SOD was spatially correlated with the differences in distribution of TOC at both locations and that these differences in distribution are likely a result of the differing hydrologic regime and watershed position. Mapping of floodplain soils at the watershed scale shows that areas of organic sediment are widespread and become more prevalent in higher order streams. DO dynamics within blackwater systems are a complicated mix of natural and anthropogenic influences, but this paper illustrates the importance of instream swamps in enhancing SOD at the watershed scale. Moreover, our study illustrates the influence of instream swamps on oxygen demand while providing support that many of these systems are naturally low in DO.
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影响因子：
--
作者：
BENCALA, KE
通讯作者：
BENCALA, KE
DOI：
10.1111/j.1752-1688.2003.tb04382.x
发表时间：
2003-04-01
影响因子：
2.4
作者：
Matlock, MD;Kasprzak, KR;Osborn, GS
通讯作者：
Osborn, GS
影响因子：
11.4
作者：
Saito, H;Goovaerts, P
通讯作者：
Goovaerts, P
DOI：
10.1016/s1093-0191(00)00075-7
发表时间：
2002-03-01
期刊：
ADVANCES IN ENVIRONMENTAL RESEARCH
影响因子：
--
作者：
Chau, KW
通讯作者：
Chau, KW
影响因子：
--
作者：
Ice, G;Sugden, B
通讯作者：
Sugden, B