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• Visual HELP擁有先進的水文模擬技術，可用于垃圾填埋場設計、滲濾液運移聚集趨勢預測、滲濾液向地下水中運移的可能性評估等。作為一款基于Windows的軟件，Visual HELP可用于設計模型并評價模擬結果。
• 基于HELP的垃圾填埋場水文優化設計軟件
• Visual HELP將新版本的HELP模型與操作簡便的界面和強大的繪圖功能結合起來，用于構建地下水模型并評價模擬結果。
• Visual HELP采用軟件工程領域前沿的技術，并引入了許多新方法，用于：
• 項目可視化與管理
• 生成輸入數據，展示模擬結果
• 實現模型間的數據共享
• 在完全一體化的模擬環境中，用戶可以進行以下操作：
• 以圖表形式創建填埋場不同區域的多個剖面圖
• 可自動生成全球各地可靠的氣象數據（或創建所在區域的數據）
• 運行復雜模型
• 以彩色、高分辨率的圖像直觀顯示模擬結果
• 為報告提供總結性文檔（表格和圖表）
• 產品概況
• 主要特征
• Visual HELP地下水軟件包擁有大量模擬工具和設計組件，幫助您實現專業可視化
• Visual Help界面
• 利用Visual HELP直觀的界面結構和專業繪圖工具，您可以靈活地選用HELP模型的基本功能和高級功能。
• 項目創建
• Visual HELP界面的邏輯結構幫助您迅速獲得經驗曲線，從而可在幾分鐘內生成并修改典型剖面圖。
• SWS氣象生成器
• 作為一個內置組件，SWS氣象生成器可為您提供全球各地100年來的可靠氣象統計數據。這一強大的工具采用的數據庫涉及3000多家國際氣象站，并包含各個地區的歷史氣象數據。
• 顯示并證明模擬結果
• Visual HELP為您提供各種繪圖工具，可幫助您正確分析和解釋模擬結果，并獲得質量報告圖表和數據總結。
• Visual HELP模型結果
• 使用這個強大的圖形工具可對每日、每月和每年的流量和體積進行報告。
• 模型結果包括時間序列數據并用于：
• 地表數據：地表存儲、融雪、徑流、入滲、蒸發、植被生長和土壤水分儲存
• 地表下的數據：橫向層排水、通過特定層滲流、通過土工膜內襯滲透物和在特定層的平均落差
• 地下水建模
• Visual HELP能夠預測季節性對地下水補給率的影響，使它成為地下水流模型軟件的優秀拍檔產品，如Visual MODFLOW Premium。
• 直接輸出流量數據（每日、每月或者年的格式）到Visual MODFLOW Premium中，說明特定場地變化的地下水補給率?，F在，地下水專家可以用它來真正地提高地下水流量模型的可靠性和質量了。
• 應用范圍
• 優化衛生填埋場的水文設計
• 評估填埋場內滲漏液的滲入率和入滲體積
• 評價填埋場防滲膜/防滲粘土的有效性
• 確定有效性的垃圾填埋場的上限，考慮邊坡、植被和氣候條件
• 預測用于Visual MDOFLOW的地下水補給率
• 產生統計學上可靠的氣象數據
• 系統要求
• 奔騰處理器
• 32MB內存
• 25MB可用磁盤空間
• VGA顯卡和鼠標
• Windows 2000/XP
• Visual HELP is the most advanced hydrological modeling environment available for designing landfills, predicting leachate mounding and evaluating potential leachate seepage to the groundwater table. Visual HELP combines the latest version of the HELP model (v.3.07) with an easy-to use interface and powerful graphical features for designing the model and evaluating the modeling results. This latest version of the HELP model addresses many of the limitations and bugs from earlier versions, and also includes several new analysis features.
• Visual HELP uses the latest technologies in software engineering to introduce many new methods for visualizing and managing your projects, generating input data, presenting modeling results, and sharing data between models.?The result is a powerful and easy-to-use modeling tool that makes hydrologic landfill modeling more practical and accessible than ever before!
• This completely-integrated modeling environment allows the user to:
• Graphically create several profiles representing different parts of a landfill
• Automatically generate statistically reliable weather data for virtually any location in the world (or create your own)
• Run complex model simulations
• Visualize full-color, high-resolution results
• Prepare a summary document (tables and graphs) for your report
• For professional applications in landfill design, Visual HELP is the only software package you will ever need!
• Visual HELP applications
• Landfill design and optimization:
• Simulate multiple landfill profiles to find the most suitable design
• Evaluate leachate mounding or leakage problems with current landfills
• Determine the effectiveness of landfill caps for reducing leachate mounding
• Design and optimize leachate collection systems
• Groundwater recharge estimation:
• Visual HELP has also proven to be an extremely valuable tool for accurately predicting seasonal groundwater recharge for periods of up to 100 years for use in MODFLOW models.? This seasonal recharge data has proven to significantly influence the vertical migration of contaminants through the unsaturated zone.
• About the HELP model
• The HELP model is a quasi-two-dimensional, deterministic, water-routing model for determining water balances.?The following is a description of the HELP model as derived from the HELP program reference manual:
• The HELP program was developed by the U.S. Army Engineer Waterways Experiment Station (WES), Vicksburg, MS for the U.S. Environmental Protection Agency (EPA), Risk Reduction Engineering Laboratory, Cincinnati, OH, in response to needs in the Resource Conservation and Recovery Act (RCRA) and the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA, better known as Superfund) as identified by the EPA Office of Solid Waste, Washington, D.C.?The primary purpose of the model is to assist in the comparison of landfill design alternatives as judged by their water balances.
• The Hydrologic Evaluation of Landfill Performance (HELP) model was developed to help hazardous waste landfill designers and regulators evaluate the hydrologic performance of proposed landfill designs.? The model accepts weather, soil and design data and uses solution techniques that account for the effects of surface storage, snowmelt, runoff, infiltration, evapotranspiration, vegetative growth, soil moisture storage, lateral subsurface drainage, leachate recirculation, unsaturated vertical drainage, and leakage through soil, geomembrane or composite liners.?Landfill system including various combinations of vegetation, cover soils, waste cells, lateral drain layers, low permeability barrier soils, and synthetic geomembrane liners may be modelled.? Results are expressed as daily, monthly, annual and long-term average water budgets.
• The original version of the HELP model was first developed at WES in 1984 (Schroeder et al., 1984a and 1984b).?Since then there have been many advances in the technology and scope of the model and many of the defects in the code have been corrected.?The latest version of the HELP model is version 3.07 which contains many significant improvements and enhancements over the previous versions.?The following is a brief outline of the enhancements that have been made since Version 2 of the HELP model (Schroeder et al., 1988a and 1988b).
• The number of layers that can be modeled has been increased
• The default soil material texture list has been expanded to contain additional waste materials, geomembranes, geosynthetic drainage nets and compacted soils
• The model now permits the use of customized soil textures
• Computations of leachate recirculation and groundwater drainage into the landfill have been added
• Leakage through the geomembranes due to manufacturing defects (pinholes) and installation mishaps (tears and punctures) is accounted for.
• Estimation of surface runoff has been improved to account for large landfill surface slopes and slope lengths
• The snow-melt model has been replaced with an energy-based model
• The Priestly-Taylor potential evapotranspiration model has been replaced with a Penman method that incorporates wind and humidity effects as well as long-wave radiation heat losses
• A frozen soil model has been added to improve infiltration and evapotranspiration predictions in cold regions
• The unsaturated vertical drainage model has also been improved to aid in storage computations