Abstract
A three-stage model is proposed to describe river processes after rapid valley-filling due to large landslides, based on surveys on the Shirayuki river basin in northeast Japan. At Stage I slightly entrenched debris avalanche deposits get covered with fluvial sediments. At Stage II the river along the upper reaches deeply cuts into fill deposits while fan aggradation occurs along the lower reaches. At Stage III river incision occurs along all the courses. This sequence of river processes reflects the changing amounts of post-landslide debris supply from the landslide scar and river banks. The three-stage model is also applicable to other examples of post-landslide river processes, although some lack the Stage I. Morphometric analyses suggest that the presence or absence of the Stage I depends on the ratio of debris supply from the landslide scar to river competence of sediment delivery.
Similar content being viewed by others
References
Iida, K.: The mud flow that occurred near the explosion-crater of Mt. Bandai on 9 and 15 May 1938, and some physical properties of volcanic mud. Bull. Earthq. Inst. Univ. Tokyo 16, 658–681 (1938).
Kato, M.: The distribution and the age of the Kisakata Deiryuu deposits in the northwest foot of the Chokai Volcano. Akita Chigaku 26, 10–14 (1977).
Machida, H.: On the accumulation terraces along the upper reaches of the River Abe. Geogr. Rev. Japan 32, 520–531 (1959).
Machida, H.: Erosional development in torrential rivers — A case study of the River Joganji in Toyama prefecture. Geogr. Rev. Japan 35, 157–174 (1962).
Machida, H.: Rapid erosion of the River Ura, Nagano prefecture, and its influence downstream on the trunk river. Geogr. Rev. Japan 37, 477–487 (1964).
Machida, H.: Rapid erosional development of mountain slopes and valleys caused by large landslide in Japan. Geogr. Rev. Tokyo Metropolitan Univ. 1, 55–78 (1966).
Machida, H.: An examination of the magnitude and recurrence of the landslide in the devastated mountain area. Suiri-kagaku 55, 30–53 (1967).
Machida, H.: Large-scale rockslides, avalanches and related phenomena: A short review. Trans. Japan. Geomorph. Union 5, 155–178 (1984).
Machida, H.; Watanabe, S.: Recent topographic changes induced by the 1888 gigantic rockslide avalanches of Bandai-san. Jour. Geography (Japan) 97, 326–332 (1988).
Moriya, I.: The landforms of Chokai Volcano observed with aerial photographs. Jour. Nihonkai-gakkai 7, 83–104 (1983).
Ohmori, H.: Dynamics and erosion rate of the river running on a thick deposit supplied by a large landslide. Zeit. Geomorph. N.F., 36, 129–140 (1992).
Ohmori, H.; Hirano, M.: Magnitude, frequency and geomorphological significance of rocky mud flows, landcreep and the collapse of steep slopes. Zeit. Geomorph., Suppl. Bd. 67, 55–65 (1988).
Osawa, A.; Ikebe, Y.; Arakawa, Y.; Tsuchiya, N.; Satoh, H.; Kakimi, T.: Geology of the Kisakata District. Quadrangle series, scale 1:50,000, Geol. Surv. Japan, 73 p. (1982).
Ouchi, S; Mizuyama, T.: Volume and movement of Tombi landslide in 1858, Japan. Trans. Japan. Geomorph. Union 10, 27–52 (1989).
Oya, A; Haneda, S.: The collapse of the caldera wall of the Bandai-san. Jour. Geol. Soc. Japan 61, 87 (1955).
Yamahama, Y.; Tokai Univ. Chokai Volcano Research Group: The age of deposition of the mud flow deposits at the northern foot of the Chokai Volcano. Abstract of the 93rd congress of the Japan Geological Society, 98 (1986).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shimazu, H., Oguchi, T. River processes after rapid valley-filling due to large landslides. GeoJournal 38, 339–344 (1996). https://doi.org/10.1007/BF00204726
Issue Date:
DOI: https://doi.org/10.1007/BF00204726