Japan has frequently experienced natural disasters because of special geological condition. Recently, disasters caused by floods and deblis flows have killed many people and involved great property loss. Therefore, development plans in areas of high erosion susceptibility should make provisions for flood and erosion control. At the same time, deterioration of riparian environment caused by civil engineering works is being seen, and warnings against limited diversity of river have been repeatedly heard. Landscape techniques can be indispensable to restore riparian environment, thus the purpose of this study is to present new technical ideas to improve riparian environment with landscape techniques associated with erosion control.
It is shown by photointerpretation and ground survey that using a series of groins suits with the characteristics of river basins for flood control on gentle slope section of tidal river, the diverse area consisting of several microtopographies are designed on the riparian zone. These area such as tidal flats, channel bars, and marsh play a significant role in preservation of various riparian ecosystem. Therefore, it can be recommended for regeneration and preservation of riparian environment that erosion control techniques which have no negative effect on uniqu riparian environment, such as groyne works, can be arranged, and that the structure, function, and dynamics of landscapes should be altered by design subsequently.

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This study confirms the existence of the method for perception of landscape shared in the society to contribute to the future landscape planning, clarifies the transition from Meiji era to the present age, and considers the current of the changes. We made the study based on a hypothesis that the collective representation, which means social consciousness shared by individuals and was advocated by a group of sociologists led by Durkheim, can exist in landscape.
For analysis, Meisho-Zue pictures and One Hundred Pictures of Scenic Spots drown between 1876 to 1986 were collected by 26 sets. The pictures totaled up to 1891 in all.
As a result, common characteristics among the works of the same period were recognized, and the existence of the collective representation in landscape were confirmed. The modern times was divided into four terms according to their characteristics ;(1) The first term of Meiji era in which Meisho were represented conceptually;(2) The later term of Meiji era and Taisyo era in which landscape were depicted objectively with a lot of modern buildings;(3) The first term of Showa era (pre World War II) in which various aspects of urban landscape were represented;(4) The later term of Showa era (post World War II) in which landscape object were represented in the reference of private interests. Also it may be discussed that the characteristics in chronological transition of the perception of landscape as following; selection of objects have been changed from those of generally acepted into those of individual; the way of perception of objects were transformed from that of conceptual to that of objective, and to that of placemental.

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