Department of Civil and Environmental Engineering, Southern Illinois University Carbondale, 1230 Lincoln Drive, Carbondale, IL 62901, USA.
Jacobs, 501 N. Broadway, St. Louis, MO 63102, USA.
J Environ Manage. 2018 May 15;214:305-314. doi: 10.1016/j.jenvman.2018.03.016. Epub 2018 Mar 10.
Growing populations and industrialized agriculture practices have eradicated much of the United States wetlands along river floodplains. One program available for the restoration of floodplains is the Conservation Reserve Program (CRP). The current research explores the effects CRP land change has on flooding zones, utilizing Flood Modeller and HEC-RAS. Flood Modeller is proven a viable tool for flood modeling within the United States when compared to HEC-RAS. Application of the software is used in the Nodaway River system located in the western halves of Iowa and Missouri to model effects of introducing new forest areas within the region. Flood stage during the conversion first decreases in the early years, before rising to produce greater heights. Flow velocities where CRP land is present are reduced for long-term scopes. Velocity reduction occurs as the Manning's roughness increases due to tree diameter and brush density. Flood zones become more widespread with the implementation of CRP. Future model implementations are recommended to witness the effects of smaller flood recurrence intervals.
不断增长的人口和工业化农业实践已经使美国河流洪泛平原的大部分湿地消失了。洪泛平原恢复的一个可用方案是保护储备计划（CRP）。本研究利用 Flood Modeller 和 HEC-RAS 探讨了 CRP 土地变化对洪水区的影响。与 HEC-RAS 相比，Flood Modeller 被证明是美国洪水建模的一种可行工具。该软件应用于位于爱荷华州和密苏里州西部的诺达瓦河系统，以模拟该地区引入新森林地区的影响。转换初期，洪水位会先下降，然后再上升到更高的高度。在长期范围内，CRP 土地存在的水流速度会降低。由于树木直径和灌木丛密度，曼宁粗糙度增加，导致流速降低。随着 CRP 的实施，洪水区变得更加广泛。建议进行未来的模型实施，以观察较小洪水重现期间隔的影响。
