In the semiarid environment, low vegetation cover and deforestation on the banks of rivers represent a strong impact on the flow resistance process, altering the interaction of the flow with the banks, one of the conditioning factors of the morphological balance of the river channel. In extreme hydrological events, turbulence and high speeds can cause a marked erosion process at the banks, increasing the sediment yield. This study aimed to monitor water and solid discharges through direct hydrosedimentometric measurements, as well as to estimate, using a simplified model based on force balance, the hydraulic roughness coefficients generated by flexible vegetation element of the Ipomoea pes-caprae species under emergent and submerged conditions. The total annual rainfall for 2019 was 748.5 mm year⁻¹, above the historical mean (642.80 mm year⁻¹). The mean depth (h = 0.24 m) and flow (Q_l = 0.15 m³ s⁻¹) rates were highly correlated as a power function (R² = 0.8041). In general, without specifically considering the effect of vegetation, the flow regime was characterized as turbulent and subcritical flow (R_e = 66,634.65 dim. and F_r = 0.16 dim.), respectively. The suspended sediment concentration (C_SS), suspended sediment (Q_SS) and bedload (Q_Bed) discharges presented mean values of 409.41 mg L⁻¹, 6.23 t day⁻¹ and 0.069 t day⁻¹, respectively. The total sediment yield (Y_t) was 1.90 t km⁻² year⁻¹. The vegetation effect was analyzed on the right (RB) and left (LB) banks, where the stems of I. pes-caprae were concentrated between 0.22 and 0.40 m and 0.66–1.20 m from the banks, respectively. On the RB, the shear (1.0 < S_r < 1.95), free flow (0.27 < S_r < 1.0) and the transition (S_r = 1) zones were identified. On the LB, just emergent condition (S_r < 1.0) was indetified. The following relationship were found between vegetation drag coefficient (C′_D), stem Reynolds number (R_ed), plant density Reynolds number (R_ev) and Froude number (F_r) on the RB: C′_D (1.22–12.46 m⁻¹); R_ed (567 < R_ed < 2224), R_ev (1305 < R_ev < 35,011) and F_r = 0.14; on the LB: C′_D (2.10–1168.29 m⁻¹); R_ed (57 < R_ed < 1427), R_ev (2615 < R_ev < 167,534) and F_r = 0.08. These results demonstrate that the aquatic vegetation directly influences the river dynamics; the density vegetation having a hydraulic impact on the flow transport capacity, that is, as the C′_D increases, it increases the resistance of the vegetation to the flow and decreases the capacity of transport of sediments.

在半干旱环境中，河岸植被覆盖度低和森林砍伐对流阻过程产生了强烈影响，改变了水流与河岸的相互作用，这是河道形态平衡的调节因素之一。在极端的水文事件中，湍流和高速会导致河岸明显的侵蚀过程，从而增加沉积物的产量。这项研究旨在通过直接的水沉降测量法监测水和固体排放物，并使用基于力平衡的简化模型估算在突发和淹没条件下番薯科植物的柔性植被要素产生的水力粗糙度系数。。2019年的年平均降雨量为748.5 mm年^-1，高于历史平均水平（642.80毫米year ^-1）。平均深度（h = 0.24 m）和流量（Q _l  = 0.15 m ³ s ^-1）速率与幂函数​​高度相关（R ²  = 0.8041）。通常，在没有特别考虑植被影响的情况下，流态的特征是湍流和亚临界流（R _e  = 66,634.65 dim。和F _r  = 0.16 dim。）。泥沙浓度（C _SS），悬浮物（Q _SS）和泥沙（Q_床）排出呈现平均值409.41毫克的L ^-1，6.23吨天^-1和0.069 t day ^-1。沉积物总产量（Y _t）为1.90 t km - ²年^-1。植被效果进行了分析右边（RB）和左（LB）的银行，的其中茎I. PES-caprae浓缩0.22和0.40米和0.66-1.20米之间从银行，分别。在RB上，确定了剪切（1.0 <S _r  <1.95），自由流（0.27 <S _r  <1.0）和过渡（S _r  = 1）区域。在LB上，刚好出现了紧急情况（S _r  <1.0）。植被阻力系数（_C'D）与茎雷诺数（R _ed）之间存在以下关系），植物密度雷诺数（R _EV）和弗劳德数（F _{- [R}上的RB）：C' _d（1.22-12.46米^-1）; R _ed（567 <R _ed  <2224），R _ev（1305 <R _ev  <35,011）和F _r  = 0.14; 在LB：C' _d（2.10-1168.29米^-1）; R _ed（57 <R _ed  <1427），R _ev（2615 <R _ev  <167,534）和F _r = 0.08。这些结果表明，水生植被直接影响河流的动力学。密度植被对水流传输能力有水力影响，也就是说，随着_C'D的增加，它增加了植被对水流的抵抗力，并降低了沉积物的传输能力。