Estimating Daily Nutrient Fluxes to a Large Piedmont Reservoir from Limited Tributary Data
Estimating Daily Nutrient Fluxes to a Large Piedmont Reservoir from Limited Tributary Data
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根据有限的支流数据估算大型山前水库的每日养分通量
DOI：
10.2134/jeq1993.00472425002200040005x
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发表时间：
1993
影响因子：
2.4
通讯作者：
L. Rogers
中科院分区：
文献类型：
--
作者：
M. Nearing;R. Risse;L. Rogers
基于物理的湖泊模型需要估计每天，空间变化的水和营养物通量从周围流域进入湖泊。然而，通常只有选定的一组流被周期性地（每月或每两周）采样。本研究的目的是开发和测试一种方法来估计每日流入一个大型水库的营养物质的采样数据选定的流域。流量，硝酸盐（NO-N），总氮（TN），可溶性活性磷（SRP），总磷（TP），化学需氧量（COD）在1991年期间每月测量8个流域饲料拉尼尔湖北方格鲁吉亚。每日流在8个流相关的数据从附近的美国地质勘探局测量流站，每日营养盐浓度与流域土地利用和每月变化的测量浓度。流域农业用地比例（AG）是唯一与非点源负荷相关的土地利用参数。AG与NO-N、TN、SRP、TP和COD的线性回归决定系数分别为0.74、0.73、0.47、0.84和0.52。的关系进行了测试，一个独立的数据集，包括两个样本从19个额外的流。径流量、NO-N、TN、SRP、TP和COD的独立试验数据的测定值与预测值之间的决定系数（r）分别为0.77、0.52、0.66、0.64、0.69和0.76。非点源负荷对营养盐负荷的贡献率在TN的76%~ TP和COD的92%之间，而农业非点源负荷的贡献率分别为COD的15%、TN的28%、NO-N的34%、TP的40%和SRP的70%。
Physically based models of lakes require estimates of daily, spatially varied water and nutrient fluxes into the lake from surrounding watersheds. Often, however, only a selected set of streams are periodically (monthly or biweekly) sampled. The objective of this study was to develop and test a method for estimating daily flux of nutrients into a large reservoir using data from sampling of selected watersheds. Flow rate, nitrate (NO-N), total nitrogen (TN), soluble reactive phosphorus (SRP), total phosphorus (TP), and chemical oxygen demand (COD) were measured monthly during 1991 for eight watersheds that feed Lake Lanier in northern Georgia. Daily stream flow in the eight streams was correlated to data from nearby USGS gauged stream stations, and daily nutrient concentrations were related to watershed land use and monthly variation in measured concentrations. Fraction of agricultural land in the watershed (AG) was the only land use parameter that correlated to nonpoint-source loads. Coefficients of determination for linear regressions between AG and NO-N, TN, SRP, TP, and COD were 0.74, 0.73, 0.47, 0.84, and 0.52, respectively. The relationships were tested on an independent data set consisting of two samples from 19 additional streams. Coefficients of determination () between measured and predicted data for the independent test data was 0.77, 0.52, 0.66, 0.64, 0.69, and 0.76 for stream flow, NO-N, TN, SRP, TP, and COD, respectively. Percentages of nutrient loads attributable to nonpoint-source loads ranged between 76% for TN to 92% for TP and COD, whereas those attributable to agricultural nonpoint source were about 15% for COD, 28% for TN, 34% for NO-N, 40% for TP, and 70% for SRP.