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Model estimated baseflow for streams with endangered Atlantic Salmon in Maine, USA
River Research and Applications ( IF 2.2 ) Pub Date : 2021-07-18 , DOI: 10.1002/rra.3835
Pamela J. Lombard 1 , Robert W. Dudley 1 , Mathias J. Collins 2 , Rory Saunders 3 , Ernie Atkinson 4
Affiliation  

We present a regression model for estimating mean August baseflow per square kilometer of drainage area to help resource managers assess relative amounts of baseflow in Maine streams with Atlantic Salmon habitat. The model was derived from mean August baseflows computed at 31 USGS streamflow gages in Maine. We use an ordinary least squares regression model to estimate mean August baseflow per unit drainage area from two explanatory variables: percentage of the basin underlain by sand and gravel aquifers and mean July precipitation in the basin. This model provides the ability to estimate mean August baseflow in cubic meters per second per square kilometer of basin area on user-selected, ungaged sites throughout Maine south of 46° 21′55″ N latitude. The model has an adjusted R2 of 0.78 and a mean 95% prediction interval of plus or minus 0.002 cubic meters per second per square kilometer. A map of the Narraguagus watershed in eastern coastal Maine shows reaches color coded by relative amounts of baseflow predicted by the model as an example of how this method could be applied throughout Maine. The map can be used to identify reaches with relatively higher amounts of baseflow during summer low flows for habitat conservation and restoration work. These areas have the potential to be high-quality habitat for Atlantic salmon and other cold-water fish because baseflows are known to moderate stream temperatures in summer low-flow periods.

中文翻译:

美国缅因州濒临灭绝的大西洋鲑鱼溪流的模型估计基流

我们提出了一个回归模型,用于估算每平方公里流域面积的 8 月平均基流,以帮助资源管理者评估缅因州河流与大西洋鲑鱼栖息地的相对基流量。该模型源自缅因州 31 个 USGS 流量测量仪计算的 8 月平均基流。我们使用普通最小二乘回归模型从两个解释变量估计每单位流域面积的 8 月平均基流:沙砾含水层下的盆地百分比和盆地 7 月的平均降水量。该模型能够在北纬 46°21'55" 以南的缅因州以南用户选择的未利用地点估算 8 月平均基流,单位为立方米每秒每平方公里流域区域。该模型具有调整后的 R 20.78,平均 95% 预测区间为每平方公里每秒正负 0.002 立方米。缅因州东部沿海纳拉瓜古斯流域的地图显示了由模型预测的基流相对量进行颜色编码的河段,作为如何在整个缅因州应用该方法的示例。该地图可用于确定夏季低流量期间基流量相对较高的河段,以进行栖息地保护和恢复工作。这些地区有可能成为大西洋鲑鱼和其他冷水鱼的优质栖息地,因为已知基流会在夏季低流量时期缓和溪流温度。
更新日期:2021-07-18
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