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• Visual HELP擁有先進(jìn)的水文模擬技術(shù)，可用于垃圾填埋場設(shè)計(jì)、滲濾液運(yùn)移聚集趨勢預(yù)測、滲濾液向地下水中運(yùn)移的可能性評估等。作為一款基于Windows的軟件，Visual HELP可用于設(shè)計(jì)模型并評價(jià)模擬結(jié)果。
• 基于HELP的垃圾填埋場水文優(yōu)化設(shè)計(jì)軟件
• Visual HELP將新版本的HELP模型與操作簡便的界面和強(qiáng)大的繪圖功能結(jié)合起來，用于構(gòu)建地下水模型并評價(jià)模擬結(jié)果。
• Visual HELP采用軟件工程領(lǐng)域前沿的技術(shù)，并引入了許多新方法，用于：
• 項(xiàng)目可視化與管理
• 生成輸入數(shù)據(jù)，展示模擬結(jié)果
• 實(shí)現(xiàn)模型間的數(shù)據(jù)共享
• 在完全一體化的模擬環(huán)境中，用戶可以進(jìn)行以下操作：
• 以圖表形式創(chuàng)建填埋場不同區(qū)域的多個剖面圖
• 可自動生成全球各地可靠的氣象數(shù)據(jù)（或創(chuàng)建所在區(qū)域的數(shù)據(jù)）
• 運(yùn)行復(fù)雜模型
• 以彩色、高分辨率的圖像直觀顯示模擬結(jié)果
• 為報(bào)告提供總結(jié)性文檔（表格和圖表）
• 產(chǎn)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(shè)計(jì)組件，幫助您實(shí)現(xiàn)專業(yè)可視化
• Visual Help界面
• 利用Visual HELP直觀的界面結(jié)構(gòu)和專業(yè)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(xiàng)目創(chuàng)建
• Visual HELP界面的邏輯結(jié)構(gòu)幫助您迅速獲得經(jīng)驗(yàn)曲線，從而可在幾分鐘內(nèi)生成并修改典型剖面圖。
• SWS氣象生成器
• 作為一個內(nèi)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(tǒng)計(jì)數(shù)據(jù)。這一強(qiáng)大的工具采用的數(shù)據(jù)庫涉及3000多家國際氣象站，并包含各個地區(qū)的歷史氣象數(shù)據(jù)。
• 顯示并證明模擬結(jié)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(jié)果，并獲得質(zhì)量報(bào)告圖表和數(shù)據(jù)總結(jié)。
• Visual HELP模型結(jié)果
• 使用這個強(qiáng)大的圖形工具可對每日、每月和每年的流量和體積進(jìn)行報(bào)告。
• 模型結(jié)果包括時間序列數(shù)據(jù)并用于：
• 地表數(shù)據(jù)：地表存儲、融雪、徑流、入滲、蒸發(fā)、植被生長和土壤水分儲存
• 地表下的數(shù)據(jù)：橫向?qū)优潘⑼ㄟ^特定層滲流、通過土工膜內(nèi)襯滲透物和在特定層的平均落差
• 地下水建模
• Visual HELP能夠預(yù)測季節(jié)性對地下水補(bǔ)給率的影響，使它成為地下水流模型軟件的優(yōu)秀拍檔產(chǎn)品，如Visual MODFLOW Premium。
• 直接輸出流量數(shù)據(jù)（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(bǔ)給率。現(xiàn)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(zhì)量了。
• 應(yīng)用范圍
• 優(yōu)化衛(wèi)生填埋場的水文設(shè)計(jì)
• 評估填埋場內(nèi)滲漏液的滲入率和入滲體積
• 評價(jià)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(yù)測用于Visual MDOFLOW的地下水補(bǔ)給率
• 產(chǎn)生統(tǒng)計(jì)學(xué)上可靠的氣象數(shù)據(jù)
• 系統(tǒng)要求
• 奔騰處理器
• 32MB內(nèi)存
• 25MB可用磁盤空間
• VGA顯卡和鼠標(biāo)
• 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