In the present study, the six legged concrete (SLC) elements are placed at the bed of a flume downstream of a chute in different layouts, densities and number of longitudinal rows of SLC elements. Each test was run for different flow conditions (Froude numbers ranged 5.3 to 8.1). During each test, the water surface profile, the roller length and the jump length measured.  Applying the experimen...

The jump number of a partial order P is the minimum number of incomparable adjacent pairs in some linear extension of P. The jump number problem is known to be NP {hard in general. However some particular classes of posets admit easy calculation of the jump number. The complexity status for interval orders still remains unknown. Here we present a heuristic that, given an interval order P , gene...