Page - 1012 - in Book of Full Papers - Symposium Hydro Engineering

Lake Name Year of Blocking Reason for Blocking Lake Name Year of Blocking Reason for Blocking East Lake 1930 Reclamation Wang Lake 1975 Embankment Caisang Lake 958 Reclamation and Embankment Chihu Lake 1983 Embankment Taibai Lake 1942 Embankment Saihu Lake 1983 Embankment Datong Lake 1951 Reclamation and Embankment Junshan Lake 1959 Sluice Huanggai Lake 1959 Embankment Wuchang Lake 1959 Sluice Honghu Lake 1955 Embankment Huangda Lake Late 50s Sluice Xiliang Lake 1935 Sluice Shengjin Lake 1962 Sluice Zhangdu Lake 1954 Sluice Chaohu Lake 1959 Sluice Daye Lake 1970 Sluice Gucheng Lake 1971 Sluice 5.2. THE DAMS AFFECTS THE UPPER STREAM-DOWNSTREAM CONNECTIVITY Dozens of migratory species, such as Coreius heterodon, Coreius guichenoti, Leptobotia elongata, migrate to the middle and upper reaches to lay drifting spawn. Most of their spawning grounds are distributed in the upstream, and their eggs drift dozens or even hundreds of kilometers to the lower reaches for fattening. Another good example is the typical river-lake migratory species of "four major Chinese carps". By 2005, 45,694 reservoirs of various types had been built in the Yangtze River Basin. Dam construction obstructs the migration routes and blocks the migration passageway between the feeding zone and reproduction zone, preventing fish from effectively completing their life history and often resulting in serious decline in resources for these fish species. If these fish do not have spawning grounds in the main channel below the dam, the effects can be very serious and even lead to their extinction. 5.3. LOSS OF LONGITUDINAL AND VERTICAL RIVER CONNECTIVITY An integrated river ecosystem includes riverways, floodplains, deep pools, shoal patches, and tributaries. During the flood season, fish follow the flow and swim to bottomland to spawn, forage, and avoid hazards. Reservoirs and Dams 1012