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Visual HELP擁有水文模擬技術，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，VisualHELP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(yōu)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
借助Visual HELP，用戶可以進行以下操作：
以圖表形式創(chuàng)建填埋場不同區(qū)域的多個剖面圖
可自動生成各地可靠的氣象數據（或創(chuàng)建所在區(qū)域的數據）
運行復雜模型模擬，以估計在可變天氣條件下通過填埋層的體積和流量
使用模擬數據的日、月和年圖表解釋和分析模型結果
使用內置報表生成器自動生成模型結果的專業(yè)報表
產品概況
主要功能：
易于使用—界面的熟悉設計和功能使其非常易于學習，并且可以使用任何可用模型進行快速模型開發(fā)
新建項目向導—通過逐步向導來指導您完成整個過程，創(chuàng)建模型非常容易（提供了模型模板以幫助您開始項目）
項目管理—基于項目的數據管理系統使用戶從處理單獨項目的大量文件中解放出來
可定制的單位—從預定義的單位模板中選擇或為所有模型參數創(chuàng)建自己的單位模板
輸入數據—項目樹可讓您快速查看和修改每個模型輪廓的結構上的輪廓，或輕松復制模型數據文件以執(zhí)行多個模板以進行靈敏度分析
模型縱斷面圖—縱斷面圖以圖形方式顯示模型縱斷面的幾何形狀，尺寸，層結構和地層
數據庫鏈接—可定義的土壤參數數據庫鏈接到各種輸入形式，以自動輸入所選特性值
WHI Weather Generator—內置的WHI Weather Generator生成長達100年的統計可靠天氣數據，用作輸入
無縫集成—在同一圖形建模環(huán)境中創(chuàng)建模型概要文件，運行模擬，可視化結果并創(chuàng)建報告文檔
結果表示—Visual HELP帶有一個功能強大的圖形組件，用于以圖形或表格形式可視化模擬結果
自動報告生成器—只需單擊一個按鈕，即可創(chuàng)建帶有列表化的輸入數據，配置文件圖形和結果顯示的富文本文檔
團隊合作—Visual HELP支持團隊合作環(huán)境，以便可以在網絡系統上運行項目文件
數據共享—從Visual HELP導出補給數據（入滲率），以用作Visual MODFLOW等飽和地區(qū)地下水模型中的補給邊界條件數據
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(yè)可視化
Visual Help界面
利用Visual HELP直觀的界面結構和專業(yè)繪圖工具，您可以靈活地選用HELP模型的基本功能和功能。
項目創(chuàng)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(qū)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(fā)、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
模型設計特征
Visual HELP是用創(chuàng)新的圖形用戶界面設計的，用戶友好的圖形工具和靈活的數據處理過程使您能夠方便的訪問幫助模型的基本和功能，包括：
用于查看和修改圖層特性和幾何圖形的模型縱斷面和交互式顯示
基于gis的交互式天氣發(fā)生器開發(fā)幫助模型輸入
一個包含42種填埋材料特性的內置數據庫
包含美國環(huán)保署推薦的填埋場剖面設計標準的內置模型模板
地下水建模
Visual HELP能夠預測季節(jié)性對地下水補給率的影響，使它成為地下水流模型軟件的拍檔產品，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。現在，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(yōu)化衛(wèi)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VisualMDOFLOW的地下水補給率
產生統計學上可靠的氣象數據
系統要求
PC Pentium
32MB內存
25MB可用磁盤空間
VGA顯卡和鼠標
Windows2000/XP
注意： Visual HELP Windows XP 32位以上的操作系統不正式支持Visual HELP軟件。不為該產品提供技術支持服務。
【英文介紹】
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
