runoff area

Fracture types include drainage fractures, structural fractures, interlayer fractures and microfractures in grains.

發育的裂縫類型有泄水縫、構造縫、層間縫和顆粒內微裂縫等類型,其中泄水縫和構造縫較為發育,顆粒內微裂縫次之。