Active Channel WRIA 1 Nooksack

Active channel hydrography (referred to as open channel or bank-to-bank polygon in the State and Tribal Riparian Monitoring and Adaptive Management Recommendations) is defined as an approximation of the active channel width of a stream determined using remote sensing methods, e.g. lidar, and is inclusive of gravel and cobble bars and the wetted portion of the stream. The active channel is analogous to the “bankfull channel” (Leopold and Maddock 1953, Leopold et al 1964, Williams 1978) or the ordinary high-water mark line (WAC 220-660-030(111), where the presence and action of waters are “so common and usual, and so long continued in ordinary years as to mark upon the soil or vegetation a character distinct from the abutting upland,” and along freshwater where this line cannot the delineated the ordinary high water line is the elevation of the mean annual flood for every three years. The intent for these data is to identify the edge of the stream riparian, i.e., where woody vegetation begins, for riparian and ecosystem monitoring. Methods document is available for download at https://wa-psp.maps.arcgis.com/sharing/rest/content/items/ef23b0e8c4ca48feac8c46c0f6d697b1/data Scripts and the spatial data framework to generate active channels are available at the Puget Sound Partnership Spatial Hub https://data-wa-psp.hub.arcgis.com/content/a3b36a7ba14e4670851503d7eb7f0e4e/about活动河道水文地貌（Active channel hydrography）在《州与部落河岸监测及适应性管理建议》中亦被称为明渠或岸到岸多边形，其被定义为通过遥感方法（如激光雷达（lidar））估算得到的河流活动河道宽度近似值，涵盖砾石滩、卵石滩以及河道的湿润区段。 该活动河道类似于“满岸河道（bankfull channel）”（引自Leopold与Maddock 1953年、Leopold等人1964年以及Williams 1978年的研究成果），或普通高水位线（ordinary high-water mark line，WAC 220-660-030(111)）。后者将水的存在与作用界定为“在正常年份中极为常见、持续时间长久，足以在土壤或植被上形成与相邻高地截然不同的特征”；对于无法划定该界线的淡水区域，普通高水位线取每三年一遇的年平均洪水水位。 本数据集的设计意图为识别河岸带的边界——即木本植被起始分布的位置，用于开展河岸带与生态系统监测工作。 方法文档可通过以下链接下载：https://wa-psp.maps.arcgis.com/sharing/rest/content/items/ef23b0e8c4ca48feac8c46c0f6d697b1/data 用于生成活动河道的脚本与空间数据框架可在普吉特海湾伙伴关系空间枢纽（Puget Sound Partnership Spatial Hub）获取：https://data-wa-psp.hub.arcgis.com/content/a3b36a7ba14e4670851503d7eb7f0e4e/about