Hydrologic modeling of low water crossing design performance at Camp Atterbury Joint Maneuver Training Center, Indiana

Hydrologic Engineering Centers River Analysis System (HEC-RAS);Low-water crossings;Sediment

Leahy, Taylor ; Kalita ; Prasanta K.

关键词: Hydrologic Engineering Centers River Analysis System (HEC-RAS);    Low-water crossings;    Sediment;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/50461/Taylor_Leahy.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

There is an ever increasing demand for sustainability around the globe; this is especially true for military land management. In an era of fiscal constraint, budgetary reductions, and increasing regulatory oversight, the appeal of efficient and effective sustainability practices is greater than ever. As the military trains, maneuver land access and mobility are a prerequisite to support the Army’s mission. Hardened low-water crossings are one practice that enables soldier mobility on the landscape. If designed, installed, and maintained correctly, low water crossings have the potential to sustain troop throughput, retain stream bank stability, and preserve stream water quality. Additionally, studies have shown that hardened low water crossings not only reduced sedimentation but also have a longer lifespan (Sample, 1998 and Malinga, 2007). In order to optimize the performance of the hardened crossings and investigate maintenance requirements, this study investigated the effect of the crossing orientation relative to the stream. Hardened low water crossings were modeled at four different sites within Camp Atterbury Joint Maneuver Training Center (CAJMTC), Indiana. Each site was analyzed for three different orientations using HEC-RAS to determine low water crossing performance during average flow events. This study examined three parameters during average flow events: stream bed shear stress, mass capacity, and accumulated mass bed change over a 90-day period. The resulting changes in sediment transport were examined and compared to ascertain optimum design orientation and maintenance requirements for each site. Overall, a single, relative orientation was not selected as the ideal scenario across the four study sites. However, the perpendicular orientation performed the best with respect to the least amount of sediment accumulated at the crossing over the study period. It is recommended that future sites at CAJMTC and similar military training lands which are similar to the ones analyzed in the study are constructed perpendicular to the stream, when a custom analysis is not plausible.