176 lines
5.4 KiB
Plaintext
176 lines
5.4 KiB
Plaintext
<ul class="nav nav-tabs">
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<li class="active"><a data-toggle="tab" href="#home">评估结果</a></li>
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<li><a data-toggle="tab" href="#menu1">技术规范</a></li>
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<li><a data-toggle="tab" href="#menu2">数据源</a></li>
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</ul>
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<div class="tab-content">
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<div id="home" class="tab-pane fade in active">
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<div class="text_cell_render rendered_html" tabindex="-1">
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<h2 class="text-center">1.气温及其变化统计</h2>
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<table width="90%">
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<tbody>
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<tr>
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<th rowspan="2">区域</th>
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<th colspan="2">背景年~基准年</th>
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<th colspan="2">基准年~评估年</th>
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<th colspan="2">两时段平均值</th>
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</tr>
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<tr>
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<th>平均值</th>
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<th>倾斜率</th>
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<th>平均值</th>
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<th>倾斜率</th>
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<th>差值</th>
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<th>变化率</th>
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</tr>
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<tr>
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<td>评价单元1</td>
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<td>-</td>
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</tr>
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<tr>
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<td>评价单元2</td>
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<td>-</td>
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</tr>
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</tbody>
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</table>
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<h2 class="text-center">2.降水量及其变化统计</h2>
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<table width="90%">
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<tbody>
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<tr>
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<th rowspan="2">区域</th>
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<th colspan="2">背景年~基准年</th>
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<th colspan="2">基准年~评估年</th>
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<th colspan="2">两时段平均值</th>
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</tr>
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<tr>
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<th>平均值</th>
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<th>倾斜率</th>
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<th>平均值</th>
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<th>倾斜率</th>
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<th>差值</th>
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<th>变化率</th>
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</tr>
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<tr>
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<td>评价单元1</td>
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<td>-</td>
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<td>-</td>
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<td>-</td>
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<td>-</td>
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</tr>
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<tr>
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<td>评价单元2</td>
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<td>-</td>
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</tr>
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</tbody>
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</table>
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<h2 class="text-center">3.湿润系数及其变化统计</h2>
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<table width="90%">
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<tbody>
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<tr>
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<th rowspan="2">区域</th>
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<th colspan="2">背景年~基准年</th>
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<th colspan="2">基准年~评估年</th>
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<th colspan="2">两时段平均值</th>
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</tr>
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<tr>
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<th>平均值</th>
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<th>倾斜率</th>
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<th>平均值</th>
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<th>倾斜率</th>
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<th>差值</th>
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<th>变化率</th>
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</tr>
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<tr>
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<td>评价单元1</td>
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<td>-</td>
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<td>-</td>
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<td>-</td>
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</tr>
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<tr>
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<td>评价单元2</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div id="menu1" class="tab-pane fade">
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<div class="text_cell_render rendered_html" tabindex="-1">
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<h2 class="text-center">1.气温和降水趋势变化率计算方法</h2>
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<p></p>
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<div align="center">Y=a<sub>0</sub>+a<sub>1</sub>t</div>
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其中:<p></p>
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<ul>
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<li>Y -- 气象要素;</li>
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<li>t -- 时间;</li>
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<li>a<sub>0</sub> -- 常数项;</li>
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<li>a<sub>1</sub> -- 线性趋势项,把a1 ×10表示为气象要素每10a的气候倾向率(变化趋势)。</li>
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</ul>
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</div>
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<div class="text_cell_render rendered_html" tabindex="-1">
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<h2 class="text-center">2.湿润指数(Im)</h2>
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<p>表示气候湿润程度的指标,是干燥度的倒数,又称湿润度、湿润系数。用地面水分的收入量与支出量的比值表示。比值越大,表示气候越湿润;比值越小,则气候越干燥。大陆性气候地区湿润系数小,海洋性气候地区湿润系数大。
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湿润指数可通过降水量和潜在蒸散量计算获得:</p>
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<p></p>
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<div align="center"><img src="/images/ei/Im.PNG" alt="Im"></div>
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式中, P 为降水量(mm), ET0 为潜在蒸散( mm·d-1)。潜在蒸散量是指大片而均匀的自然表面在足够湿润条件下水体保持充分供给时的蒸散量。ET0采用 FAO推荐的Penman-Monteith 公式计算:
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<p></p>
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<p></p>
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<div align="center"><img src="/images/ei/ET0.PNG" alt="ET0"></div>
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<p></p>
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<p></p>
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<div align="center"><img src="/images/ei/Rn.PNG" alt="Rn"></div>
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<p></p>
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<p></p>
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<div align="center"><img src="/images/ei/Gi.PNG" alt="Gi"></div>
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式中:<p></p>
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<ul>
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<li>ET<sub>0</sub> -- 潜在蒸散量(mm·d<sup>-1</sup>);</li>
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<li>R<sub>n</sub> -- 参考作物表面净辐射(MJ·m<sup>-2</sup>·d<sup>-1</sup>);</li>
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<li>G -- 土壤热通量(MJ·m<sup>-2</sup>·d<sup>-1</sup>);</li>
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<li>γ-- 干湿表常数(kPa·℃);</li>
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<li>e<sub>s</sub> -- 饱和水汽压(kPa);</li>
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<li>e<sub>a</sub> -- 实际水汽压(kPa);</li>
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<li>U<sub>2</sub> -- 2m高处的平均风速(m·s<sup>-1</sup>);</li>
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<li>σ -- Stefen-Boltzmann常数(4.903*10<sup>-9</sup>MJ·K<sup>-4</sup>·m<sup>-2</sup>·d<sup>-1</sup>)) ,
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</li>
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<li>Δ -- 表示饱和水汽压-温度曲线的斜率(kPa·℃);</li>
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<li>T -- 绝对温标的气温(K),</li>
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<li>T<sub>max,k</sub>、T<sub>min,k</sub> -- 分别为热力学温标的最高和最低气温(K),</li>
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<li>T<sub>i</sub>、T<sub>i-1</sub> -- 分别为本月和前一个月的平均气温,</li>
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<li>n -- 实际日照时数(h),</li>
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<li>N -- 可照时数(h),</li>
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<li>R<sub>so</sub> -- 晴天辐射(MJ·m<sup>-2</sup>·d<sup>-1</sup>)。</li>
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</ul>
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</div>
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</div>
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<div id="menu2" class="tab-pane fade">
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<h4>数据源</h4>
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</div>
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</div> |