Improving Accuracy in Earthwork Volume Estimation for Proposed Forest Roads Using a High-Resolution Digital Elevation Model
Improving Accuracy in Earthwork Volume Estimation for Proposed Forest Roads Using a High-Resolution Digital Elevation Model
复制标题
使用高分辨率数字高程模型提高拟建林道土方量估算的准确性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Chung
中科院分区：
文献类型：
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作者：
M. Contreras;Pablo Aracena;W. Chung
Nacrtak土方工程通常是建造低交通量森林道路的最大成本部分。准确估计公路工程量对于预测施工成本和改善公路施工业务的财务控制至关重要。传统上，使用考虑从沿着道路坡度线的测量站获得的地面数据的方法来估计道路体积。然而，当忽略测量站之间的地形变化时，这些方法可能无法提供准确的估计。在这项研究中，我们开发了一个计算机化的模型，以准确地估计拟议的森林道路的植被体积，通过使用高分辨率的数字高程模型（DEM）。我们将我们的模型应用到三个假设的森林道路布局与不同的地面坡度和地形崎岖的条件。我们研究了不同横截面间距对土壤体积估算准确性的影响，假设1米间距提供»真实«土壤体积。我们还比较了我们的模型结果与传统的端面积法。结果表明，随着横截面间距的增加，由于缺乏捕捉地形变化的能力，体积估计的准确性降低。我们量化了地形起伏的差异，这种差异随着地形起伏的增加而增加，范围从2%到21%。正如预期的那样，当道路规划和位于丘陵和崎岖地形时，应采用短横截面间距，以提高交通流量估计的准确性。
Nacrtak Earthwork usually represents the largest cost component in the construction of low-volume forest roads. Accurate estimates of earthwork volume are essential to forecast construction costs and improve the financial control of road construction operations. Traditionally, earthwork volumes are estimated using methods that consider ground data obtained from survey stations along road grade lines. However, these methods may not provide accurate estimates when terrain variations between survey stations are ignored. In this study, we developed a computerized model to accurately estimate earthwork volumes for the proposed forest roads by using a high-resolution digital elevation model (DEM). We applied our model to three hypothetical forest road layouts with different ground slopes and terrain ruggedness conditions. We examined the effects of various cross-section spacings on the accuracy of earthwork volume estimation assuming that 1-meter spacing provides the »true« earthwork volume. We also compared our model results with those obtained from the traditional end-area method. The results indicate that as cross-section spacing increases the accuracy of earthwork volume estimation decreases due to lack of the ability to capture terrain variations. We quantified earthwork differences, which increased with terrain ruggedness ranging from 2 to 21%. As expected, short cross-section spacing should be applied to improve accuracy in earthwork volume estimation when roads are planned and located on hilly and rugged terrain.