A dataset on physico-chemical hyporheic variables in the Selune River: Towards understanding the impact of dam removal on riverbed clogging processes oleh Mouhamadoul Moustapha Ba, Joris Heyman, Agnès Rivière, Marc Oliver Soulayrol, Vincent Stubbe, Francois Meric, Bruno Kergosien, Pascal Rolland, Chistophe Petton, Nicolas Lavenant, Jean Jacques Kermarrec, Alain Crave