Why do some rivers build deltas and others don't?

Jaap Nienhuis, Utrecht University, Department of Physical Geography, Utrecht, Netherlands, Andrew D Ashton, WHOI, Geology and Geophysics, Woods Hole, MA, United States, Ton Hoitink, Wageningen University, Environmental Sciences, Wageningen, Netherlands, Albert Kettner, University of Colorado Boulder, INSTAAR, Boulder, CO, United States, Joel C Rowland, Los Alamos National Laboratory, Los Alamos, NM, United States and Torbjorn E Tornqvist, Tulane University, Department of Earth and Environmental Sciences, New Orleans, LA, United States