High-precision measurements of wetland sediment elevation: II. The rod surface elevation table
High-precision measurements of wetland sediment elevation: II. The rod surface elevation table
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DOI：
10.1306/020702720734
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发表时间：
2002-09-01
影响因子：
2
通讯作者：
Hensel, P
中科院分区：
文献类型：
--
作者：
Cahoon, DR;Lynch, JC;Hensel, P
描述了一种用于测量紧急和浅水湿地系统中沉积物高度的新型高精度装置。杆表面高程表 (RSET) 是一种平衡、轻型机械调平装置，可安装在浅（< 1 m）和深（驱动至拒绝）的杆基准上。 RSET 是为了补充表面高程表 (SET) 而设计的，这是一种更大、更重的机械水准仪，由 Boumans 和 Day (1993) 首次描述。由于其尺寸和重量，SET 必须连接到管道基准标记上，通常必须将其驱动到 > 1 m 的深度才能保持稳定。由于管道的表面阻力较大，管道被驱动至拒绝深度，但通常比杆基准线浅。因此，与 SET 相比，RSET 可以将沉积物高程的变化划分为较浅（例如，根区）和较深的沉积剖面深度。单个针脚高度的置信区间。由两名不同的操作员在实验室条件下使用 RSET 测量的结果为 +/-1.0 和 +/-1.5 mm。在现场条件下，单个销钉测量高度的置信区间范围为红树林中的 +/-1.3 毫米到盐沼中的 +/-4.3 毫米。
A new high-precision device for measuring sediment elevation in emergent and shallow water wetland systems is described. The rod surface-elevation table (RSET) is a balanced, lightweight mechanical leveling device that attaches to both shallow (< 1 m) and deep (driven to refusal) rod bench marks. The RSET was built to complement the surface-elevation table (SET), a larger and heavier mechanical leveling device first described by Boumans and Day (1993). Because of its size and weight, the SET must be attached to a pipe bench mark, which typically must be driven to a depth > 1 m in order to be stable. The pipe is driven to refusal but typically to a depth shallower than the rod bench mark because of greater surface resistance of the pipe. Thus, the RSET makes it possible to partition change in sediment elevation over shallower (e.g., the root zone) and deeper depths of the sediment profile than is possible with the SET. The confidence intervals for the height of an individual pin mea. measured by two different operators with the RSET under laboratory conditions were +/-1.0 and +/-1.5 mm. Under field conditions, confidence intervals for the measured height of an individual pin ranged from +/-1.3 mm in a mangrove forest up to +/-4.3 mm in a salt marsh.