Both a full moon and a lunar eclipse can have an effect on tides, although they are slightly different phenomena.
A Full Moon: During a full moon, the Earth, Moon, and Sun are approximately aligned, with the Earth in the middle. The gravitational forces exerted by the Moon and the Sun combine, leading to the highest tidal range known as spring tides. Spring tides occur twice a month, during the full moon and the new moon. During a spring tide, high tides are higher than usual, and low tides are lower than usual. This is because the gravitational pull of the Moon and the Sun reinforces each other.
A Lunar Eclipse: A lunar eclipse occurs when the Earth is directly between the Sun and the Moon, causing the Earth's shadow to fall on the Moon. Unlike a solar eclipse, a lunar eclipse is visible from anywhere on the nighttime side of the Earth. The occurrence of a lunar eclipse does not have a direct impact on tides because the alignment of the Earth, Moon, and Sun is not the same as during a full moon or a new moon. The gravitational effects are not significantly altered during a lunar eclipse.
It's important to note that while the gravitational forces of the Moon and the Sun influence tides, other factors such as local geography, wind patterns, and ocean currents also contribute to the complexity of tidal patterns. Therefore, the tides can be influenced by multiple factors in addition to the phases of the Moon.