This section contains only general information on the available mooring options. To develop an effective mooring strategy, a variety of application-specific criteria must be thoroughly reviewed prior to deployment. Adverse weather conditions, water level fluctuations, currents and wave action, debris loads, and other factors can cause entanglement of mooring lines, submersion of the buoy, and damage to sensors and other components. NexSens does not endorse any particular mooring strategy for any application unless the end user performs a thorough review of the site conditions with the NexSens engineering team.
CB-400 buoys contain a total of four bottom-side eye nuts to accommodate single-point, two-point and three-point mooring styles. Three of the eye nuts are arranged in a semi-circle directly at the bottom of the hull for two- and three-point moorings. The final eye nut is located on the bottom of the buoy frame or instrument cage if one is installed. This nut is used for single-point moorings or to deploy sensor chains.
Single-point moorings are used in extremely calm waters when monitoring sensors are attached to the instrument cage or housed in deployment pipes. The sensors are thus protected and less vulnerable to damage caused by subsurface debris, high currents, and entanglement from anchor lines.
In a single-point configuration, a stainless steel mooring line connects the buoy directly to a bottom chain and anchor. The anchor, bottom chain, and mooring line are assembled and attached to the buoy prior to deploying the system.
Figure 1: Typical Single-Point Mooring Setup
Two-Point and Three-Point Moorings
Two-point moorings are commonly used when monitoring sensors are deployed in the water column below the buoy. In this setup, the mooring lines are pulled taut away from the buoy, freeing the water column for a suspended sensor line.
In most two-point configurations, mooring lines connect the data buoy to small marine marker buoys. These marker buoys are shackled to another mooring line that runs to the seafloor and connects via a bottom chain to an anchor.
Three-point configurations are similar to two-point, but a third set of anchors, mooring lines and marker buoys keep the buoy in place.
Figure 2: Typical Two-Point Mooring Setup