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首页> 外文期刊>Journal of the American Water Resources Association >A MODELING SYSTEM TO ASSESS LAND COVER LAND USE CHANGE EFFECTS ON SAV HABITAT IN THE MOBILE BAY ESTUARY
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A MODELING SYSTEM TO ASSESS LAND COVER LAND USE CHANGE EFFECTS ON SAV HABITAT IN THE MOBILE BAY ESTUARY

机译：评估移动海湾海域栖息地生物多样性变化影响的土地覆盖变化模型系统

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Estuarine ecosystems are largely influenced by watersheds directly connected to them. In the Mobile Bay, Alabama watersheds we examined the effect of land cover and land use (LCLU) changes on discharge rate, water properties, and submerged aquatic vegetation, including freshwater macrophytes and seagrasses, throughout the estuary. LCLU scenarios from 1948, 1992, 2001, and 2030 were used to influence watershed and hydrodynamic models and evaluate the impact of LCLU change on shallow aquatic ecosystems. Overall, our modeling results found that LCLU changes increased freshwater flows into Mobile Bay altering temperature, salinity, and total suspended sediments (TSS). Increased urban land uses coupled with decreased agricultural/pasture lands reduced TSS in the water column. However, increased urbanization or agricultural/pasture land coupled with decreased forest land resulted in higher TSS concentrations. Higher sediment loads were usually strongly correlated with higher TSS levels, except in areas where a large extent of wetlands retained sediment discharged during rainfall events. The modeling results indicated improved water clarity inthe shallow aquatic regions of Mississippi Sound and degraded water clarity in the Wolf Bay estuary. This integrated modeling approach will provide new knowledge and tools for coastal resource managers to manage shallow aquatic habitats that provide critical ecosystem services.
机译：河口生态系统在很大程度上受到与其直接相连的流域的影响。在阿拉巴马州莫比尔湾的分水岭，我们研究了河口整个区域的土地覆盖率和土地利用变化（LCLU）对流量，水质和水下生物植被（包括淡水大型植物和海草）的影响。 1948年，1992年，2001年和2030年的LCLU情景被用来影响流域和水动力模型，并评估LCLU变化对浅水生态系统的影响。总体而言，我们的建模结果发现，LCLU的变化增加了流入莫比尔湾的淡水量，从而改变了温度，盐度和总悬浮沉积物（TSS）。城市土地使用的增加，加上农业/牧草土地的减少，减少了水柱中的总悬浮固体。但是，城市化进程的加快或农业/牧草用地的减少，加上林地的减少，导致TSS浓度升高。较高的沉积物负荷通常与较高的TSS水平密切相关，除了在降雨事件期间大量湿地保留了沉积物排放的区域之外。模拟结果表明，密西西比海峡浅水区的水透明度提高，而沃尔夫湾河口的水清晰度降低。这种综合的建模方法将为沿海资源管理者提供新的知识和工具，以管理提供关键生态系统服务的浅水生境。

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