Geoecological risks in the valleys of small rivers of the forest-steppe zone of the Russian plain (on the example of the Chuvash Republic)Inna Nikonorova, Vladimir Ilyin, Anastasia Ilyina and Nikolay PetrovE3S Web Conf., 431 (2023) 04007DOI: https://doi.org/10.1051/e3sconf/202343104007