I don't believe that you can disprove Noah's flood and ark story, just as you cannot disprove 100%:
1) That some unknown, extremely hard form of tree existed.
2) That the ark was made of petrified wood and that enough petrified wood existed to build it
3) That "gopher wood" refers to some other material than real tree wood
4) That some strange, unknown, extremely strong building material and design exists like tar made out of something as strong as titanium
5) That God miraculously provided any of the above mentioned criteria
6) That Noah didn't build his ark out of a combination of ice and sawdust (Pykrete) a combination that has been shown to serve as suitable materials for a modern large seagoing ship.
7) That God didn't provide enough miracles to make such a ship feasible
Why do I least these 7 challenges about Noah's ark?
Because Noah's ark, built to the Bible's specifications is unfloatable as we know it.
That's right, ladies and gentlemen, Noah's ark is a sinker.
When a wooden boat is built to the scale of Noah's ark, it sinks. It is torn apart at the seams by the "torque" of water. That is why no boat has ever been built of that size or larger. The best that architects have been able to do when floating a wooden boat the size of the ark is float it on barges, that is, float it on another boat that is not made of wood. Because wooden boats of that size and scale are torn apart by the torque of water.
But guess what? Just because a wooden ark of that size is impossible by our knowledge of physics and boat design does not disprove it. Why? Because... miracles. Because we don't know what "gopher wood" is. Maybe "gopher wood" was an expression for iron, and Noah had a method for making iron in enough quantities to build the boat, which ancient man temporarily forget as a result of the flood. Nothing is impossible. Maybe miracles held the boat together. Maybe they discovered Pykrete and found a way to make real wood from a "gopher" tree into Pykrete.
The Impossible Voyage of Noah's Ark
How could he anticipate the effects of roll, pitch, yaw, and slamming in a rough sea? How did he solve the differential equations for bending moment, torque, and shear stress?
...in the words of A. M. Robb, there was an "upper limit, in the region of 300 feet, on the length of the wooden ship; beyond such a length the deformation due to the differing distributions of weight and buoyancy became excessive, with consequent difficulty in maintaining the hull watertight" (p. 355). Pollard and Robertson concur, emphasizing that "a wooden ship had great stresses as a structure. The absolute limit of its length was 300 feet, and it was liable to `hogging' and `sagging' " (pp. 13-14). This is the major reason why the naval industry turned to iron and steel in the 1850s. The largest wooden ships ever built were the six-masted schooners, nine of which were launched between 1900 and 1909. These ships were so long that they required diagonal iron strapping for support; they "snaked," or visibly undulated, as they passed through the waves, they leaked so badly that they had to be pumped constantly, and they were only used on short coastal hauls because they were unsafe in deep water.
http://ncse.com/cej/4/1/impossible-voyage-noahs-ark
Yes, he says that, but look what the Smithsonian says:
Could Noah’s Ark Float? In Theory,
Yes
Basic physics suggests that an ark carrying lots of animal cargo could float
...according to Euler-Bernoulli beam theory, the strength of a wooden beam decreases with its size, so because when things get bigger they break more easily, the beams that held this huge ark together might have been extremely fragile. Else the beams were short, which would also introduce structural weaknesses due to the higher number of seams between wood planks.
Read more:
http://www.smithsonianmag.com/scien...oat-theory-yes-180950385/#VOpljOgeHVaoCfAD.99
It cannot be disproven, because of the 7 reasons I listed at the top.
Now, whether it's realistic or matches our knowledge of the normal workings of nature and shipbuilding is a different question.
Do I believe the Noah's ark story? No. The fact that such a wooden boat, if we built it today, would normally get ripped apart by the waves minus some intervening, unmentioned element like a covering of iron is just one of numerous reasons why I think it is far too unlikely to be real. But since such a strange, "unrealistic" thing could "theoretically" occur, it can't be disproven either.