The severe incidences of Microcystis blooming in 1980s of the Sagami and Tsukui reservoirs, located in Sagami river, Japan were effectively controlled by the installation of 8 and 5 bubbling circulation systems, respectively. However, the blooming had started again in those reservoirs. It was found that those algal blooming occurred due to the formation of strong stratification following a temp...

50 A groundwater investigation including several pumping tests has been carried out by 51 Thames Water Utilities Limited (TWUL) to improve the understanding of the 52 distribution of hydraulic properties of the Chalk in the Swanscombe area of Kent in 53 south-eastern England. The pumping test behaviour is complicated by: the fractured 54 condition of the Chalk, simultaneous pumping from adjacen...

This is the first attempt to combine Multiobjective Billiards-Inspired Optimization Algorithm (MOBOA) with groundwater modelling determine pumping rates within a well-distributed range of Pareto options. In this study, in order an optimum solution for drawdown, were selected accompanied by three minimization objectives: minimizing shortage influenced inability supply, adjusted index, and degree...

Abstract Today, statistics show that most of the accidents leading to dam failures occur in case embankment dams and, therefore, authors have chosen analyse state safety operation Buftea Dam Romania. The need for such analysis is sustained by fact has an important role flood protection on Colentina River, which flows through a number localities vicinity capital city Romania, Bucharest (Buftea a...

Commonly used analytical approaches for estimation of pumping-induced drawdown and stream depletion are based on a series of idealistic assumptions about the stream-aquifer system. A new solution has been developed for estimation of drawdown and stream depletion under conditions that are more representative of those in natural systems (finite width stream of shallow penetration adjoining an aqu...

We propose a general framework for studying last passage times, suprema and drawdowns of a large class of continuous-time stochastic processes. Our approach is based on processes of class Sigma and the more general concept of two processes, one of which moves only when the other is at the origin. After investigating certain transformations of such processes and their convergence properties, we ...

[1] Growing season CH4 fluxes were monitored over a two year period following the start of ecosystem-scale manipulations of water table position and surface soil temperatures in a moderate rich fen in interior Alaska. The largest CH4 fluxes occurred in plots that received both flooding (raised water table position) and soil warming, while the lowest fluxes occurred in unwarmed plots in the lowe...

Abstract Reservoir drawdown areas—where sediment is exposed to the atmosphere due water-level fluctuations—are hotspots for carbon dioxide (CO 2 ) emissions. However, global extent of areas unknown, precluding an accurate assessment budget reservoirs. Here we show, on basis satellite observations 6,794 reservoirs between 1985 and 2015, that 15% reservoir area was dry. Exposure most pronounced i...