BOLTON & MENK
GeoHECRAS 让整个洪水地图更新过程变得超级简单
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大多数洪泛区研究都是使用 HEC-RAS 稳态模型计算的。稳态模型是一种公认的标准，但在某些情况下会产生与实际情况相差甚远的结果。
Bolton & Menk 是一家位于明尼苏达州曼卡托市的土木、环境和交通工程公司，该公司承接了一个项目，需要在一个拥有复杂河道和湿地系统的高度发达地区进行洪泛区分析。
湿地 "下沉 "带来的挑战
Jordan Thole, a water resource design engineer at Bolton & Menk, had primary responsibility for creating a flood map for the lower regions of Sand Creek in Scott County, part of the Sand Creek watershed in the Minnesota River Basin.
The challenge presented by this project involved a point near the City of Jordan where a public highway could be overtopped and flood water diverted into a very large wetland. After the flood water entered the wetland, it eventually reconnected with Sand Creek.
When the HEC-RAS model for this segment of Sand Creek was run in a steady state, the wetland filled with water, a situation that would never realistically occur since it would require that peak flow be sustained for days. Thole concluded that if the flooded area was to be mapped accurately, an unsteady flow analysis was needed in addition to a hydrograph showing change in flow over time.
按需 "软件开发
Thole 联系了 CivilGEO，希望了解 GeoHECRAS 能否进行必要的非稳态流洪泛区侵占分析。当时，GeoHECRAS 还不具备这种能力。但 CivilGEO 的工程团队认为，建立非稳态流洪泛区侵蚀模型的能力将为软件增添价值，只要团队齐心协力就能实现。
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经过四天的编码工作后，应用程序开始运行，Thole 可以使用完全流体力学的流量分析来执行洪泛区侵占。
当 HEC-RAS 模型进行非稳定流模拟时，湿地就像一块海绵，吸收洪水并减弱水流。流经该区域的水量大大减少。较低的 BFE（基流高程）对于位于该流域的大型住宅区来说显然是个好消息。
"我们制作这些模型所花的时间可能只有以前的一半"。
使用 GeoHECRAS 更新洪水地图
最近，根据联邦紧急事务管理局（FEMA）的授权，对洪水通道进行了更新和测绘。然而，该研究是采用稳定流分析方法进行的。根据该分析得出的峰值高程要高得多。约旦市要求使用非稳定流分析法更新所有洪水地图。
Thole 报告说，使用 GeoHECRAS 直观的用户界面，更新洪水地图的过程几乎不费吹灰之力。旧版地图通常只显示极少的河流几何形状，但 GeoHECRAS 允许用户轻松添加横截面。
Also, using the Army Corps HEC-RAS program would have required a laborious process of building multiple models and running comparisons of surface water elevations through Excel or a similar program. Thole said, “GeoHECRAS lets you update maps on the fly. It’s so much easier.”
Thole was also grateful for the technical support he received through CivilGEO. “I wish every piece of software we owned had the technical support that CivilGEO provides.”
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