The Study On Regulation Of Reservoir's Design Floods Influenced By Human Activities

With China's socio-economic development and increasing attention to water resources projects' construction paid by Chinese government, the upstream areas of many reservoirs which were originally natural catchments are currently intervened by different kinds of human activities. These rational and irrational human activities altered reservoirs' catchments natural conditions, as a result, their geological, geographical and hydrological characteristics become more complicated, and consequently their greatly changed hydrological regimes affected reservoirs' routine operation. If reservoirs are still operated according to the original regulating rules, this will cause negative impacts on, or even serious damage to, people's lives and cities' infrastructure, threaten the safety of reservoirs or waste effective resources. The construction of middle and small-size reservoirs is impact-profound human activities. This paper aims to conduct flood-routing of designed inflow floods of downstream reservoirs under consideration of existence of upstream middle and small-size reservoirs, quantitatively analyze the degree of impact of the upstream reservoirs' dam-break floods or flood-regulating functions on design inflow floods of the downstream reservoirs. The paper selected Changtan reservoir in Guangdong province as case study site, investigated the impacts of 4 upstream reservoirs on Changtan reservoir's design inflow floods and explored Changtan reservoir's flood-protection standards, regulating rules and potential for integrated water resources utilization after newly-constructed upstream reservoirs being taken into account.