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首页> 外文期刊>Journal of the American Water Resources Association >MODELING NITROGEN TRANSPORT IN THE IPSWICH RIVER BASIN, MASSACHUSETTS, USING A HYDROLOGICAL SIMULATION PROGRAM IN FORTRAN (HSPF)
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MODELING NITROGEN TRANSPORT IN THE IPSWICH RIVER BASIN, MASSACHUSETTS, USING A HYDROLOGICAL SIMULATION PROGRAM IN FORTRAN (HSPF)

机译：使用FORTRAN（HSPF）的水文模拟程序模拟马萨诸塞州伊普斯维奇河盆地的氮运移

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摘要

Increased riverine nitrogen (N) fluxes have been strongly correlated with land use changes and are now one of the largest pollution problems in the coastal region of the United States. In the present study, the Hydrological Simulation Program-FORTRAN (HSPF) is used to simulate transport of N in the Ipswich River basin in Massachusetts and to evaluate the effect of future land use scenarios on the water quality of the river. Model results show that under a land use change scenario constructed with restrictions from environmental protection laws, where 44 percent of the forest in the basin was converted to urban land, stream nitrate concentrations increased by about 30 percent of the present values. When an extreme land use scenario was used, and 100 percent of the forest was converted to urban land, concentrations doubled in comparison to present values. Model simulations also showed that present stream nitrate concentrations might be four times greater than they were prior to urbanization. While pervious lands with high density residential land use generated runoff with the highest N concentrations in HSPF simulations, the results suggested that denitrification in the riparian zone and wetlands coupled with the hydrology of the basin are likely to control the magnitude of nitrate loads to the aquatic system. The simulation results showed that HSPF can predict the general patterns of inorganic N concentrations in the Ipswich River and tributaries. Nevertheless, HSPF has some difficulty simulating the extreme variability of the observed data throughout the main stem and tributaries, probably because of limitations in the representation of wetlands and riparian zones in the model, where N processes such as denitrification seem to play a major role in controlling the transport of N from the terrestrial system to the river reaches.
机译：河流氮流量的增加与土地利用的变化密切相关，现在已成为美国沿海地区最大的污染问题之一。在本研究中，FORTRAN水文模拟程序（HSPF）用于模拟马萨诸塞州伊普斯维奇河流域中氮的迁移，并评估未来土地利用情景对河流水质的影响。模型结果表明，在受到环境保护法律限制的情况下进行的土地利用变化情景中，流域中44％的森林被转化为城市土地，河流硝酸盐浓度增加了当前值的30％。如果使用极端的土地使用方案，并且100％的森林被转换为城市土地，那么与当前价值相比，其浓度将增加一倍。模型模拟还表明，目前的河流硝酸盐浓度可能是城市化之前的四倍。在HSPF模拟中，虽然具有高密度居住土地利用的透水土地产生的N浓度最高，但径流区和湿地的反硝化作用与流域的水文状况相结合可能会控制硝酸盐对水生生物的负荷量。系统。模拟结果表明，HSPF可以预测伊普斯维奇河和支流中无机氮的含量的一般模式。然而，HSPF在模拟整个主干和支流中观测到的数据的极端变异性方面存在一些困难，这可能是由于该模型中湿地和河岸带的表示存在局限性，在该过程中，诸如反硝化之类的N个过程似乎在其中起着主要作用。控制氮从陆地系统到河段的运输。

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