USACE Wetland Delineation Regions

Region and subregion boundaries are depicted as sharp lines, however, climatic conditions and the physical and biological characteristics of landscapes do not change abruptly at the boundaries. In reality, regions and subregions often grade into one another in broad transition zones. In transitional areas, the investigator must use experience and good judgment to select the supplement and indicators that are appropriate to the site based on its physical and biological characteristics. If in doubt about which supplement to use in a transitional area, apply both supplements and compare the results. For additional guidance, contact the appropriate Corps of Engineers District Regulatory Office.区域与次区域边界以清晰线条进行绘制，但气候条件以及景观的物理、生物特征并不会在边界处发生突变。实际场景中，区域与次区域往往会通过大范围过渡带彼此逐渐过渡融合。在过渡区域内，研究人员需结合自身经验与专业判断，依据场地的物理与生物属性，选取适配该场地的补充项与指标。若对过渡区域内应选用何种补充项存在疑问，则可同时采用两类补充项并对比其结果。如需获取更多指导，请联系对应辖区的美国陆军工程兵团（Corps of Engineers）监管办公室。