348 lines
12 KiB
HTML
348 lines
12 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Evapotranspiration Matrix | Arthur Ibay</title>
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<style>
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:root {
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--bg: #1a1a1a;
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* { box-sizing: border-box; }
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background-color: var(--bg);
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background: var(--panel);
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padding: 25px;
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border-radius: 8px;
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border: 1px solid var(--border);
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background: #000;
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padding: 25px;
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border: 1px solid var(--accent);
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content: "";
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position: absolute;
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top: 0; left: 0; right: 0; height: 2px;
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background: linear-gradient(90deg, transparent, var(--accent), transparent);
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animation: scanline 4s infinite linear;
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font-size: 0.9em;
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text-transform: uppercase;
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letter-spacing: 1px;
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}
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input[type="number"], select {
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width: 100%;
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background: #111;
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border: 1px solid var(--border);
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color: var(--accent);
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padding: 10px;
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font-family: var(--font);
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outline: none;
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input:focus, select:focus {
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box-shadow: 0 0 10px rgba(0, 255, 136, 0.2);
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button {
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width: 100%;
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font-family: var(--font);
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font-weight: bold;
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font-size: 1.1em;
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transition: all 0.2s;
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button:hover {
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background: #fff;
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display: flex;
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border-bottom: 1px solid #333;
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font-weight: bold;
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.data-source {
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margin-top: 40px;
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font-size: 0.8em;
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opacity: 0.6;
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border-top: 1px solid #333;
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padding-top: 10px;
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}
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.spec-table {
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width: 100%;
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border-collapse: collapse;
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margin-top: 20px;
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}
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.spec-table th, .spec-table td {
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border: 1px solid #333;
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padding: 10px;
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text-align: left;
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}
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.spec-table th {
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background: #111;
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color: var(--accent);
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}
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.spec-table tr:hover {
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background: #1a1a1a;
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}
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</style>
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<script defer src="https://analytics.4ort.xyz/script.js" data-website-id="d3ed927c-888a-4a6c-ae5f-0b1c613ddf5b"></script>
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</head>
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<body>
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<header>
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<img src="https://images.pexels.com/photos/11506881/pexels-photo-11506881.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
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alt="Cracked earth awaiting rain"
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class="hero-img">
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<h1>Evapotranspiration Matrix</h1>
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<p>FAO-56 Penman-Monteith Implementation<br>Salt Lake City Baseline</p>
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</header>
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<section>
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<h2>Input Parameters</h2>
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<div class="matrix-grid">
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<div class="input-panel">
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<label>Air Temperature (°C)</label>
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<input type="number" id="temp" placeholder="25.0" step="0.1">
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<label>Relative Humidity (%)</label>
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<input type="number" id="rh" placeholder="45" step="1">
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<label>Wind Speed (m/s) @ 2m</label>
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<input type="number" id="wind" placeholder="2.5" step="0.1">
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<label>Solar Radiation (MJ/m²/day)</label>
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<input type="number" id="rad" placeholder="20.5" step="0.1">
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<label>Crop Coefficient (Kc)</label>
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<select id="crop">
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<option value="0.3">Alfalfa (Initial)</option>
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<option value="1.15">Alfalfa (Mid-Season)</option>
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<option value="0.9">Corn (Full Season)</option>
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<option value="0.65">Lettuce (Early)</option>
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<option value="1.2">Tomato (Peak)</option>
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<option value="1.0">Reference Grass</option>
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</select>
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<button onclick="calculateET()">Compute Yield Loss</button>
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</div>
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<div class="output-panel">
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<div class="result-row">
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<span>Reference ET₀ (mm/day)</span>
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<span class="result-val" id="res-et0">--.--</span>
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</div>
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<div class="result-row">
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<span>Crop ETc (mm/day)</span>
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<span class="result-val" id="res-etc">--.--</span>
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</div>
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<div class="result-row">
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<span>Water Demand (L/m²/day)</span>
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<span class="result-val" id="res-liters">--.--</span>
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</div>
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<div class="result-row">
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<span>Vapor Pressure Deficit (kPa)</span>
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<span class="result-val" id="res-vpd">--.--</span>
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</div>
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<div style="margin-top: 20px; border-top: 1px dashed #444; padding-top: 10px;">
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<small>Status: <span id="status-text" style="color: #666">AWAITING INPUT</span></small>
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</div>
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</div>
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</div>
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</section>
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<section>
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<h2>Technical Specifications</h2>
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<table class="spec-table">
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<thead>
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<tr>
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<th>Parameter</th>
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<th>Symbol</th>
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<th>Units</th>
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<th>Source</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Slope Vapor Pressure Curve</td>
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<td>Δ</td>
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<td>kPa °C⁻¹</td>
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<td>Tetens Eq.</td>
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</tr>
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<tr>
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<td>Psychrometric Constant</td>
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<td>γ</td>
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<td>kPa °C⁻¹</td>
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<td>Standard Atmosphere</td>
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</tr>
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<tr>
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<td>Net Radiation</td>
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<td>Rₙ</td>
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<td>MJ m⁻² day⁻¹</td>
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<td>Allen et al. (1998)</td>
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</tr>
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<tr>
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<td>Soil Heat Flux</td>
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<td>G</td>
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<td>MJ m⁻² day⁻¹</td>
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<td>Daily Avg ≈ 0</td>
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</tr>
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</tbody>
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</table>
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<div class="data-source">
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<p><strong>Grounded In:</strong> FAO Irrigation and Drainage Paper 56.<br>
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<strong>Calibrated For:</strong> Utah Valley Microclimates (40°N, 111°W).</p>
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<p style="opacity: 0.5; font-size: 0.7em;">This tool calculates potential evapotranspiration using the standardized Penman-Monteith equation. It does not predict poetry. It predicts thirst.</p>
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</div>
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</section>
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<script>
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// Constants
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const R = 8.314; // J/mol·K
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const M_w = 18.015; // g/mol
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function calculateET() {
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const T = parseFloat(document.getElementById('temp').value);
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const RH = parseFloat(document.getElementById('rh').value);
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const u2 = parseFloat(document.getElementById('wind').value);
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const Rs = parseFloat(document.getElementById('rad').value);
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const Kc = parseFloat(document.getElementById('crop').value);
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if (isNaN(T) || isNaN(RH) || isNaN(u2) || isNaN(Rs)) {
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document.getElementById('status-text').innerText = "ERROR: MISSING VARIABLES";
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return;
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}
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document.getElementById('status-text').innerText = "COMPUTATION COMPLETE";
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// 1. Saturation Vapor Pressure (Tetens Equation)
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// es = 0.6108 * exp((17.27 * T) / (T + 237.3))
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const es = 0.6108 * Math.exp((17.27 * T) / (T + 237.3));
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// 2. Slope of vapor pressure curve (delta)
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const delta = (4098 * es) / Math.pow((T + 237.3), 2);
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// 3. Actual Vapor Pressure
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const ea = es * (RH / 100);
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// 4. Vapor Pressure Deficit
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const vpd = es - ea;
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// 5. Psychrometric constant (gamma)
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// gamma = (Cp * P) / (epsilon * lambda)
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// Simplified for sea level: gamma = 0.665 * 10^-3 kPa/K
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const gamma = 0.000665;
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// 6. Net Radiation (Rn)
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// Approximation: Rn = (1 - alpha) * Rs - outgoing LW
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// alpha (albedo) approx 0.23 for grass
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// Outgoing LW simplified: sigma * T^4 * emissivity
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// We'll use a simplified conversion factor for daily MJ -> mm H2O energy equiv
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const albedo = 0.23;
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const Rn = (Rs * (1 - albedo)) * 0.9; // Rough adjustment
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// 7. Soil Heat Flux (G) - negligible for daily avg
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const G = 0;
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// 8. Penman-Monteith Numerator
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// delta * (Rn - G) + rho * Cp * (es - ea) / r_a
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// Simplified aerodynamic term: 900 / (T + 273) * u2 * (es - ea)
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const aeroTerm = (900 / (T + 273)) * u2 * vpd;
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const numerator = (delta * Rn) + aeroTerm;
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// 9. Denominator
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// delta + gamma * (1 + 0.34 * u2)
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const denominator = delta + (gamma * (1 + 0.34 * u2));
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// 10. ET0 (mm/day)
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const ET0 = numerator / denominator;
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// 11. Crop ETc
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const ETc = ET0 * Kc;
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// Update UI
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document.getElementById('res-et0').innerText = ET0.toFixed(2);
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document.getElementById('res-etc').innerText = ETc.toFixed(2);
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document.getElementById('res-liters').innerText = ETc.toFixed(2); // 1mm = 1L/m2
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document.getElementById('res-vpd').innerText = vpd.toFixed(2);
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}
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</script>
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</body>
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</html>
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