energies Article A Simple Fractal-Based Model for Soil-Water Characteristic Curves Incorporating Effects of Initial Void Ratios Gaoliang Tao 1 ID , Yin Chen 1 ID , Lingwei Kong 2 ID , Henglin Xiao 1, Qingsheng Chen 1,* and Yuxuan Xia 3 1 Hubei Provincial Ecological Road Engineering ...