Đang chuẩn bị liên kết để tải về tài liệu:
Simulation of Ground-Water Flow and Evaluation of Water-Management Alternatives in the Assabet River Basin, Eastern Massachusetts

The technical and nontechnical vulnerabilities associated with an IT system’s processing environment can be identified via the information-gathering techniques described in Section 3.1.2. A review of other industry sources (e.g., vendor Web pages that identify system bugs and flaws) will be useful in preparing for the interviews and in developing effective questionnaires to identify vulnerabilities that may be applicable to specific IT systems (e.g., a specific version of a specific operating system). The Internet is another source of information on known system vulnerabilities posted by vendors, along with hot fixes, service packs, patches, and other remedial measures that may be applied. | Simulation of Ground-Water Flow and Evaluation of Water-Management Alternatives in the Assabet River Basin Eastern Massachusetts By Leslie A. DeSimone In cooperation with the Massachusetts Department of Conservation and Recreation Scientific Investigations Report 2004-5114 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton Secretary U.S. Geological Survey Charles G. Groat Director U.S. Geological Survey Reston Virginia 2004 For sale by U.S. Geological Survey Information Services Box 25286 Denver Federal Center Denver CO 80225 For more information about the USGS and its products Telephone 1-888-ASK-USGS World Wide Web http www.usgs.gov Any use of trade product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation DeSimone L.A. 2004 Simulation of ground-water flow and evaluation of water-management alternatives in the Assabet River Basin eastern Massachusetts U.S. Geological Survey Scientific Investigations Report 2004-5114 133 p. iii Contents Abstract . 1 Introduction.2 Purpose and Scope.4 Description of the Study Area.4 Previous Studies.4 Ground- and Surface-Water Resources.5 Geologic Setting.5 Hydraulic Properties.7 Ground-Water Flow. 10 Recharge. 10 Water Levels. 11 Surface Water. 17 Streamflow. 17 Ponds and Wetlands.20 Water Use and Management.22 Water Supply and Consumptive Use.24 Wastewater Discharge and Return Flow.32 Simulation of Ground-Water Flow.33 Steady-State Numerical Model.33 Spatial Discretization.33 Boundary Conditions.33 Stresses.36 Recharge and Evapotranspiration.36 Water Withdrawals and Discharges.37 Hydraulic Properties.37 Model Calibration.40 Model-Calculated Water Budgets and Flows.45 Transient Numerical Model.46 Temporal .