In an arid zone the sediment budget is predominantly dependent on runoff, which is controlled mainly by the type of rainfall. Sediment budget calculation is one of the indirect methods of estimating channel morphodynamics. This method is advised here since it is not possible to directly measure this important hydrological indicator of environmental dynamics. This is because in small mountain catchments of an arid zone it is impossible to obtain flow rates due to factors such as the amount and size of transported rock debris, as well as the episodic and sudden nature of precipitation events. The research was conducted in 3 catchments (2.95 km², 7.39 km², 22.73 km²) situated within the boundaries of the basin of the upper Dades, on the southern slopes of the High Atlas in Morocco. The rivers of these catchments, tributaries to a trunk river Dades, are ephemeral and mostly bedrock depending on lithology of the geology. Three automatic weather stations were installed there. Precipitation events ≥ 10 mm (51 rains in 3 catchments) were used in the analysis. Simple rainfall typology (3 types) was devised for these events. During the research period seasonally repeated (6 times) measurements of topography were obtained from 21 cross-section profiles of streams of different order. These measurements formed a basis for calculating both the intensity of flow in ephemeral rivers (max 69,6 m/s) and the sediment budget. In 70% of analysed channel cross-sections erosion was dominant. The average change of the surface area of the cross-section profile is −82%. The maximum seasonal (between measurements) enlargement of the surface cross-section (erosion) is as high as 128%. The lower catchment, which is predominantly composed of conglomerates, distinctly shows the slightest changes of the cross-section profile surfaces, max 24%. The average volume of channel material displaced at the measurement point is 1.07 m³ (max 9.81 m³). There is evidence that not only high intensity rains, but also less intense but longer lasting rains, amounting to high precipitation totals (type C), may result in the highest channel sediment budgets. Differences between a catchment lithology composed of limestones and marlstones and that composed of conglomerates have only a minor impact on sediment budgets in the first and second order channels, whereas in the channels of the third and fourth order this impact is much higher. It was found that sediment budgets calculated for individual channels were higher for the catchments composed of limestones and marlstones, than for those composed of conglomerates, even though the catchments of different lithology may have had the same number of tributaries. This suggests that the sediment supply from slopes is comparatively larger in the catchments dominated by limestones and marlstones.

在干旱地区，沉积物的预算主要取决于径流，径流主要受降雨类型的控制。泥沙预算计算是估算河道水动力的间接方法之一。这里建议使用此方法，因为不可能直接测量环境动力学的这一重要水文指标。这是因为在干旱地区的小山区流域，由于诸如所运输的岩石碎屑的数量和大小以及降水事件的突发性和突发性等因素，无法获得流速。该研究是在3个集水区（2.95公里进行²，7.39公里²，22.73公里²）位于上Dades盆地的边界内，在摩洛哥High Atlas的南坡上。这些集水区的河流，即主干河达德斯的支流，是短暂的，并且大部分是基岩，这取决于地质的岩性。那里安装了三个自动气象站。分析中使用了≥10 mm的降水事件（3个流域的51次降雨）。针对这些事件设计了简单的降雨类型（3种类型）。在研究期间，从不同顺序的河流的21个横截面剖面图中获得了季节性重复（6次）的地形测量结果。这些测量结果为计算短暂河流的流量强度（最大69.6 m / s）和沉积物预算奠定了基础。在70％的已分析通道横截面中，侵蚀占主导地位。横截面轮廓的表面积的平均变化为-82％。表面横截面的最大季节性增大（两次测量之间）（侵蚀）高达128％。下部集水区主要由砾岩组成，清楚地显示出剖面轮廓表面的最小变化，最大为24％。在测量点处位移的通道材料的平均体积为1.07 m³（最大9.81 m ³）。有证据表明，不仅高强度降雨，而且强度较低但持续时间更长的降雨，总计高降水总量（C型），可能导致河道沉积物预算最高。在第一和第二阶河道中，由石灰石和玛石组成的集水岩性与由砾岩组成的集水岩性之间的差异仅对沉积物预算有很小的影响，而在第三和第四阶河​​道中，这种影响要大得多。结果发现，尽管不同岩性的流域可能有相同的支流，但由石灰岩和马利石组成的流域的单个渠道计算出的沉积物预算要高于由砾岩组成的流域。