TY JOUR TI Filtration in a heterogeneous base of hydraulic structures with a complex underground contour KW filtration KW pressure loss KW heterogeneous soil KW flutebet KW element KW hydraulic structure KW dam JO Melioration and Water Management AU Kachaev, A.E. AU Turapin, S.S. PY 2026 IS 2025 PB ANO Editorial Board Melioration and water management