This paper mainly reviews the regulations, laws and policies on Post-project Environmental Appraisals of dam projects formulated in the world. In addition, handbooks and guidelines for PPEA were also collected and analyzed from evaluation contents, procedures, methods and latest approaches. International experiences were listed and defragged to compare with China, suggestions were given to complete Chinese EIA and PPEA system.
Hydropower development and effects on fish assemblages by dams in Lancang River Basin have arisen great concerns. As a compensation measure, Xishuangbanna State Nature Reserve was established at Luosuo River in 2007, to protect fish species affected by dams in lower Lancang River. Based on published data of fish since 1950s, we analyzed the fish biodiversity of Luosuo River and the similarity with species of lower Lancang River, using G-F index and Sprensen similarity index respectively. The results clearly show that fish biodiversity is quite high at the genus level in Luosuo River. 60 species (including 20 endemic species) were recorded in both reaches, accounting for 71.43% of total species in lower Lancang River. Similar composition of fish community and high similarity indicate that Luosuo River has the potential to protect most of fish species (including endemic species) under hydropower development in the downstream of Lancang River.
This paper mainly summarized the theoretical, methodology and practical development of river ecosystem health assessment. And analyzed the priorities and major issues we are facing. Combined with post-project environmental appraisal (PPEA) which is now increasingly be used. At last recommendations for PPEA in dam and reservoir projects was proposed.
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