Because tide comes and goes, and they wanted to have the first troops and vehicles off the beach before the next high tide.
Because of the nature of the unknown underwater obstacles to the landing craft on the beaches the D Day attack was at low tide: Dawn of June 6th 1944. First light would be about 5 am.
In a way it was beneficial to the Allies. The cross channel conditions were such that the invasion, although expected somewhere, was unlikely to happen in a less than calm sea. But the tidal situation was vital, the landing craft would be hampered by underwater obstacles unless landing at a very low tide: Eisenhower took the chance. The surprise element was crucial to success.
Because of the underwater defenses built it was necessary to land at low tide. This was the reason that the invasion was effected when it was. The landings were therefore at first light in early June, which would be about 4 am giving the Allies maximum daylight to get ashore.
Draught of vessel + clearance from bottom required + fall of tide (fall = depth of current tide minus depth of next low water)
Because tide comes and goes, and they wanted to have the first troops and vehicles off the beach before the next high tide.
Attacking during low tide allowed the allies to navigate around submerged obstacles like beach obstacles and mines. This made it easier for landing craft to approach the beach and disembark troops safely. Additionally, low tide provided more visibility for troops landing on the beach.
neap tide
you have a high tide and low tide, tides are affected by the Moon. There is also something called Neap tide and Spring tide. Spring tide occurs in spring and sometime throughout the year. Neap tide is when there is a higher low tide and a lower low tide. Spring tide is when there is a higher low tide and lower high tide
A low tide is often refered to as an "ebb" tide.
low tide in the night high tide in the day
The time for high tide and low tide depends on the date of the tide, and the place where you are measuring high and low tide. There isn't a fixed number, unfortunately.
High tide or low tide. There is also summer tide (I think) which is a really large tide, and a spring tide which is a very low tide.
2 high tides and 2 low tides in one day. All of them have different heights (Ex. One high high tide, then one high low tide, then a low high tide, then a low low tide.
2 high tides and 2 low tides in one day. All of them have different heights (Ex. One high high tide, then one high low tide, then a low high tide, then a low low tide.
High tide comes before low tide. The tidal cycle starts with high tide, then transitions to low tide, and then returns to high tide before repeating the cycle.
If the sun didn't help the moon make a high tide and low then there wouldn't be such of a high tide and probably when there is a low tide the water will be even further than a regular low tide.