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Transient wave propagation in composite media: A Green functions approach

A generalized Green functions technique for wave propagation of transient fields in one-dimensional media is developed. The medium is partitioned into an arbitrary number of subslabs for which Green operators, that map the incident field to the internal fields, are defined. Relations between the Green operators for the entire medium and the Green operators for the subslabs are derived. The techniq

Floodwater recharge to improve sustainable water supply in arid Iran

Groundwater depletion in arid areas is of increasing concern in the Middle East. Small precipitation and high evaporation losses during the dry season lead to water shortage in arid areas. The optimum development of groundwater resources is generally associated with abstractions from the aquifer balancing the recharge to it. When abstractions exceed recharge, many undesirable effects may result. D