| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 105 === In hydrographic analysis, the data of water depth during rainstorms is a very important parameter. In the past, people used sounding weight to measure water depth; however, this conventional method is time consuming, labor density and high risk, also the rapid river caused the sounding weight cannot sink vertically, directly to the bottom of the water, that it can’t measure the correct water depth. In the report of All flood process automated depth Observing System Planning mechanical systems, the 4th river management office adopted mechanical drop modified sounding weight to improve shortcomings, shortage of manpower and dangerous, and the modified sounding weight overcomes the problem that the sounding weight can’t sink quickly.
In this study,three-dimensional computational fluid hydrodynamics software,FIUENT,is adopted to simulate and analysis flow field.The model applies the finite volume discrete control equation and the SIMPLE method coupled velocity and pressure to satisfy the mass conservation and momentum conservation.The first simulation present flow field,distance and force taken difference between the modified sounding weight sink into water in free fall and the convetional sounding weight sink into water in constant speed.The second simulation present time difference between modified sounding weight sink into water and convetional sounding weight sink into water in free fall.From the above simulation,the modified sounding weight can effectively improve the convetional sounding weight shortcomings.Finally,using the new instrument and convetional sounding weight measurement results as verification data in the report of All flood process automated depth Observing System Planning and building.The result prove the new instrument measurement can be used.
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